A - Z Test List

Test List: G

# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

For reference ranges related to any specific test, please email refranges@hslpathology.com

Please note this list may not show our full repertoire of tests. If you need further information, please call +44 (0) 20 7307 9400

Please click here to read our user guide. More user guides will be available soon.

Important notice regarding biotin interference in laboratory tests – please click here to read our update.

Expand All | Collapse All

G6PD

Code

G6PD

Sample Reqs

A

Special Instructions

Gabapentin

Code

GABA

Sample Reqs

B [4]

Special Instructions

[4] Send to the laboratory without delay.

Galactomanan (Aspergillus Antigen)

Code

SGAL

Sample Reqs

B

Special Instructions

Galactose-1-Phosphate Uridyltransferase

Code

GAL1

Sample Reqs

H [5] [6]

Special Instructions

[5] Do not send sample to the laboratory between Friday noon and Monday morning.
[6] Contact the Referrals Department before taking and sending sample to the laboratory.

Galactosidase – Alpha*

Code

GALA

Sample Reqs

J

Special Instructions

* Sample must reach TDL Referrals Dept. urgently, to be tested within 24 hours of collection. Monday–Thursday only. Referrals to send immediately

Gall Stone Analysis

Code

RSTA

Sample Reqs

STONE

Special Instructions

Gamma GT

Code

GGT

Sample Reqs

B

Special Instructions

Ganglionic Acetylcholine Receptor Antibodies

Code

GACA

Sample Reqs

B

Special Instructions

Ganglioside GM1, GD1B, GQ1B Abs

Code

GANG

Sample Reqs

B

Special Instructions

Gardnerella vaginalis by PCR

Code

GVPC

Sample Reqs

FCRU / PCR / TPV

Special Instructions

Gardnerella vaginalis

Code

GVPC

Sample Reqs

TPV

Special Instructions

Gastric Cancer NGS Panel – full sequencing across 15 genes + deletions/duplications

Code

GENE

Sample Reqs

A
A
[9] [11] Requires patient informed consent

Special Instructions

[9] Clinical history must be provided.
[11] Patient consent required. Consent Form can be found at the back of this guide.

Gastric Parietal Autoantibodies

Code

GASP

Sample Reqs

B

Special Instructions

Gastrin

Code

GAST

Sample Reqs

B (Frozen)

Special Instructions

Gaucher Disease full gene sequencing

Code

GDMA

Sample Reqs

A
[40]

Special Instructions

[40] Informed Consent is required for these tests.

Gaucher Disease – 8 common mutations

Code

GENE

Sample Reqs

A
[9]

Special Instructions

[9] Clinical history must be provided.

Genetic Reproductive Profile (Male) – see profiles

Code

GRP

Sample Reqs

A
H [9]

Special Instructions

[9] Clinical history must be provided.
]

Gentamicin Assay

Code

GENT

Sample Reqs

B [4]

Special Instructions

[4] Send to the laboratory without delay.

GI Endoscopic – Biopsy: Bile duct biopsy

Code

HIS1

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Colonic Polyp

Code

HIS1

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (1 specimen)

Code

HIS1

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (10-15 specimens)

Code

10H1

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (2 specimens)

Code

2H1

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (3 specimens)

Code

3H1

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (4 specimens)

Code

4H1

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (5 specimens)

Code

5H1

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (6 specimens)

Code

6H1

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (7 specimens)

Code

7H1

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (8 specimens)

Code

8H1

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (9 specimens)

Code

9H1

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Liver Biopsy – Medical

Code

HIS5

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Liver Biopsy – Tumour

Code

HIS3

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Omental Biopsy

Code

HIS3

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Pancreatic Biopsy

Code

HIS1

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Perianal Biopsy

Code

HIS1

Sample Reqs

Special Instructions

GI Resection – Large: Biliary Resection

Code

HIS5

Sample Reqs

Special Instructions

GI Resection – Large: Colon

Code

HIS5+HIS2

Sample Reqs

Special Instructions

GI Resection – Large: Distal Pancreatectomy

Code

HIS5

Sample Reqs

Special Instructions

GI Resection – Large: Gastrectomy

Code

HIS5+HIS2

Sample Reqs

Special Instructions

GI Resection – Large: Gastric Wedge Resection

Code

HIS5

Sample Reqs

Special Instructions

GI Resection – Large: Ileoanal Pouch Resection

Code

HIS5

Sample Reqs

Special Instructions

GI Resection – Large: Ileostomy

Code

HIS4

Sample Reqs

Special Instructions

GI Resection – Large: Ileum

Code

HIS3

Sample Reqs

Special Instructions

GI Resection – Large: Large Bowel Resection – Benign / Malignant

Code

HIS5+HIS2

Sample Reqs

Special Instructions

GI Resection – Large: Liver Wedge Resection

Code

HIS4

Sample Reqs

Special Instructions

GI Resection – Large: Oesophagectomy

Code

HIS5+HIS2

Sample Reqs

Special Instructions

GI Resection – Large: Partial Hepatectomy

Code

HIS5

Sample Reqs

Special Instructions

GI Resection – Large: Small Bowel Resection – Benign / Malignant

Code

HIS5

Sample Reqs

Special Instructions

GI Resection – Large: Whipple’s Procedure / Pancreatectoduodenectomy

Code

HIS5+HIS5

Sample Reqs

Special Instructions

GI-Resection – Small: Anal Fistula

Code

HIS215

Sample Reqs

Special Instructions

GI-Resection – Small: Appendix

Code

HIS2

Sample Reqs

Special Instructions

GI-Resection – Small: Endo Mucosal Resection (EMR / ESD)

Code

HIS3

Sample Reqs

Special Instructions

GI-Resection – Small: Gallbladder

Code

HIS2

Sample Reqs

Special Instructions

GI-Resection – Small: Haemorrhoidectomy

Code

HIS2

Sample Reqs

Special Instructions

GI-Resection – Small: Hernia Sac

Code

HIS2

Sample Reqs

Special Instructions

GI-Resection – Small: Meckel’s Diverticulum

Code

HIS3

Sample Reqs

Special Instructions

GI-Resection – Small: Mesentery

Code

HIS2

Sample Reqs

Special Instructions

GI-Resection – Small: Perianal Biopsy / Warts

Code

HIS2

Sample Reqs

Special Instructions

GI-Resection – Small: Pilonidal Sinus

Code

HIS2

Sample Reqs

Special Instructions

GI-Resection – Small: Polypectomy

Code

HIS2

Sample Reqs

Special Instructions

GI-Resection – Small: Umbilical Lesion

Code

HIS2

Sample Reqs

Special Instructions

Giardia Serology

Code

GIAR

Sample Reqs

B

Special Instructions

Gilbert Syndrome – common UGT1A1 repeat variation

Code

GENE

Sample Reqs

A
[9]

Special Instructions

[9] Clinical history must be provided.

Glaucoma NGS Panel – full gene sequencing across 26 genes

Code

GENE

Sample Reqs

A
A
[9]

Special Instructions

[9] Clinical history must be provided.

Gliadin Antibodies (IgG) (deamidated )

Code

AGAB

Sample Reqs

B

Special Instructions

Globulin

Code

GLOB

Sample Reqs

B

Special Instructions

Glomerular Basement Membrane Abs

Code

AGBM

Sample Reqs

B

Special Instructions

Glucagon

Code

GLUG

Sample Reqs

J [1]

Special Instructions

[1] Contact the laboratory for special sample tubes/containers/instructions.

Glucose-6-Phosphate Dehydrogenase (G6PD) Deficiency – full G6PD gene sequencing

Code

GENE

Sample Reqs

A
[9]

Special Instructions

[9] Clinical history must be provided.

Glucose Challenge Test / Mini-GTT

Code

RBGM

Sample Reqs

G

Special Instructions

Collection time (minutes post-glucose): 1 at 60 mins (50gm glucose)

Glucose Tolerance Test (Extended Plus)

Code

GTTX

Sample Reqs

7x G 7x RU

Special Instructions

Collection time (minutes post-glucose): 1 each at 0, 30, 60, 90, 120, 150 and 180 mins

Glucose Tolerance Test (Extended)

Code

GTTE

Sample Reqs

5 x G 5 x RU

Special Instructions

Collection time (minutes post-glucose): 1 each at 0, 30, 60, 90 and 120 mins

Glucose Tolerance Test (Short)

Code

GTTS

Sample Reqs

2 x G 2 x RU

Special Instructions

Collection time (minutes post-glucose): 1 each at 0 and 120 mins

Glucose Tolerance Test / OGTT

Code

GTT

Sample Reqs

3 x G 3 x RU

Special Instructions

Collection time (minutes post-glucose): 1 each at 0, 60 and 120 mins (75gm glucose load)

Glucose Tolerance with Growth Hormone

Code

GTT + GHDF

Sample Reqs

3 x B [35] 3 x G 3 x RU

Special Instructions

[35] Patient should be fasting and resting for 30 mins before sample taking. Samples need handling urgently.

Collection time (minutes post-glucose): 1 each at 0, 60 and 120 mins

Glucose Tolerance with Insulin

Code

GTTI

Sample Reqs

3 x B 3 x G 3 x RU

Special Instructions

Collection time (minutes post-glucose):1 each at 0, 60 and 120 mins

Glucose

Code

RBG

Sample Reqs

G

Special Instructions

Glutamic Acid Decarboxylase Antibodies (GAD 65)

Code

GAD

Sample Reqs

B

Special Instructions

Glutathione (Red Cell)

Code

GLUR

Sample Reqs

H [5]

Special Instructions

[5] Do not send sample to the laboratory between Friday noon and Monday morning.

Glutathione Peroxidase

Code

GLPX

Sample Reqs

H

Special Instructions

Gluten Allergy Profile

Profile details

Gluten single IgE Allergen

Endomysial Abs IgA

Gliadin Abs deamidated IgG

Tissue transglutaminase IgA

HLA DQ2/DQ8

Total IgA

Code

GLUT

Sample Reqs

A  B  B 

Special Instructions

 

Gluten Sensitivity Evaluation (Coeliac disease antibody)

Profile details

Endomysial IgA

Gliadin deamidated lgG

Total IgA

Tissue Transglutaminase (IgA)

Code

GSA

Sample Reqs

B 

Special Instructions

 

Gluten/Coeliac Profile 2

Code

GSA2

Sample Reqs

A B

Special Instructions

Glycan Determinants

Code

ZZ27

Sample Reqs

B

Special Instructions

Glycogen storage disease type 2 (Pompe) mutation analysis

Code

POMP

Sample Reqs

A
 

Special Instructions

Gonorrhoea (PCR swab)

Code

SGON

Sample Reqs

PCR

Special Instructions

Gonorrhoea (Thin Prep)

Code

TGON

Sample Reqs

TPV

Special Instructions

Gonorrhoea (Urine)

Code

CGON

Sample Reqs

FCRU

Special Instructions

Gonorrhoea by Culture

Code

GONN

Sample Reqs

CS‡ ‡ ‡

Special Instructions

‡ ‡ ‡ The optimal sample type from the female genital tract is an endocervical swab. Gonorrhoea does not survive well outside the endocervical epithelium; a negative gonorrhoea culture result from a vaginal swab is not reliable for excluding infection.

Granulocyte Immunology

Code

GRIM

Sample Reqs

A A

Special Instructions

Group B Strep

Code

GBS

Sample Reqs

2 x STM

Special Instructions

Growth Hormone (Fasting)

Code

GH

Sample Reqs

B [7] [35]

Special Instructions

[7] Sample should be separated and frozen if sending overnight.
[35] Patient should be fasting and resting for 30 mins before sample taking. Samples need handling urgently.

Gut Hormone Profile

Code

GUTP

Sample Reqs

A A (Frozen within 15 minutes) [41]

Special Instructions

[41] Recommendation for patient to attend Patient Reception for sample taking.

Gynaecology: Cervical Biopsy

Code

HIS2

Sample Reqs

Special Instructions

Gynaecology: Cervical Polyp

Code

HIS1

Sample Reqs

Special Instructions

Gynaecology: Cervix

Code

HIS4

Sample Reqs

Special Instructions

Gynaecology: Curettings – Endocervical

Code

HIS1

Sample Reqs

Special Instructions

Gynaecology: Curettings – Endometial

Code

HIS1

Sample Reqs

Special Instructions

Gynaecology: Endometrial Biopsy

Code

HIS2

Sample Reqs

Special Instructions

Gynaecology: Endometrial Pipelle

Code

HIS1

Sample Reqs

Special Instructions

Gynaecology: Endometrial Polyp

Code

HIS1

Sample Reqs

Special Instructions

Gynaecology: Fallopian Tube

Code

HIS2

Sample Reqs

Special Instructions

Gynaecology: Fibroids

Code

HIS3

Sample Reqs

Special Instructions

Gynaecology: Fimbrial Cyst

Code

HIS2

Sample Reqs

Special Instructions

Gynaecology: LLETZ and / or Cone Biopsy

Code

HIS4

Sample Reqs

Special Instructions

Gynaecology: Mastoid

Code

HIS2

Sample Reqs

Special Instructions

Gynaecology: Ovarian Biopsy

Code

HIS2

Sample Reqs

Special Instructions

Gynaecology: Ovarian Cyst

Code

HIS2

Sample Reqs

Special Instructions

Gynaecology: Ovarian Pipelle

Code

HIS1

Sample Reqs

Special Instructions

Gynaecology: Ovaries (Bilateral)

Code

HIS5

Sample Reqs

Special Instructions

Gynaecology: Ovary (Unilateral)

Code

HIS3

Sample Reqs

Special Instructions

Gynaecology: Ovary and Tube (Bilateral)

Code

HIS5

Sample Reqs

Special Instructions

Gynaecology: Ovary and Tube (Unilateral)

Code

HIS4

Sample Reqs

Special Instructions

Gynaecology: Pelvic Mass

Code

HIS2

Sample Reqs

Special Instructions

Gynaecology: Peritoneal Biopsy

Code

HIS1

Sample Reqs

Special Instructions

Gynaecology: Placenta

Code

HIS5

Sample Reqs

Special Instructions

Gynaecology: Pouch of Douglas

Code

HIS2

Sample Reqs

Special Instructions

Gynaecology: Products of Conception

Code

HIS1

Sample Reqs

Special Instructions

Gynaecology: Uterine Polyp

Code

HIS2

Sample Reqs

Special Instructions

Gynaecology: Uterus

Code

HIS4

Sample Reqs

Special Instructions

Gynaecology: Uterus and Cervix

Code

HIS5

Sample Reqs

Special Instructions

Gynaecology: Uterus, Tubes And Ovaries

Code

HIS5

Sample Reqs

Special Instructions

Gynaecology: Vulval Biopsy

Code

HIS1

Sample Reqs

Special Instructions

Contact Us

HSL is a partnership between The Doctors Laboratory, Royal Free London NHS Foundation Trust (the Royal Free London) and University College London Hospitals NHS Foundation Trust (UCLH)

Health Services Laboratories
Health Services Laboratories
Health Services Laboratories