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.

For key information on Anti-SARS-CoV-2 antibody testing – please click here.

Expand All | Collapse All

G6PD

Sample Reqs

A

Special Instructions

Gabapentin

Sample Reqs

B [4]

Special Instructions

[4] Send to the laboratory without delay.

Galactomanan (Aspergillus Antigen)

Sample Reqs

B

Special Instructions

Galactose-1-Phosphate Uridyltransferase

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*

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

Sample Reqs

STONE

Special Instructions

Gamma GT

Sample Reqs

B

Special Instructions

Ganglionic Acetylcholine Receptor Antibodies

Sample Reqs

B

Special Instructions

Ganglioside GM1, GD1B, GQ1B Abs

Sample Reqs

B

Special Instructions

Gardnerella vaginalis by PCR

Sample Reqs

FCRU / PCR / TPV

Special Instructions

Gardnerella vaginalis

Sample Reqs

TPV

Special Instructions

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

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

Sample Reqs

B

Special Instructions

Gastrin

Sample Reqs

B (Frozen)

Special Instructions

Gaucher Disease full gene sequencing

Sample Reqs

A
[40]

Special Instructions

[40] Informed Consent is required for these tests.

Gaucher Disease – 8 common mutations

Sample Reqs

A
[9]

Special Instructions

[9] Clinical history must be provided.

Genetic Reproductive Profile (Male) – see profiles

Sample Reqs

A
H [9]

Special Instructions

[9] Clinical history must be provided.
]

Gentamicin Assay

Sample Reqs

B [4]

Special Instructions

[4] Send to the laboratory without delay.

GI Endoscopic – Biopsy: Bile duct biopsy

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Colonic Polyp

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (1 specimen)

Sample Reqs

Special Instructions

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

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (2 specimens)

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (3 specimens)

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (4 specimens)

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (5 specimens)

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (6 specimens)

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (7 specimens)

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (8 specimens)

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Endoscopic Biopsy (9 specimens)

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Liver Biopsy – Medical

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Liver Biopsy – Tumour

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Omental Biopsy

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Pancreatic Biopsy

Sample Reqs

Special Instructions

GI Endoscopic – Biopsy: Perianal Biopsy

Sample Reqs

Special Instructions

GI Resection – Large: Biliary Resection

Sample Reqs

Special Instructions

GI Resection – Large: Colon

Sample Reqs

Special Instructions

GI Resection – Large: Distal Pancreatectomy

Sample Reqs

Special Instructions

GI Resection – Large: Gastrectomy

Sample Reqs

Special Instructions

GI Resection – Large: Gastric Wedge Resection

Sample Reqs

Special Instructions

GI Resection – Large: Ileoanal Pouch Resection

Sample Reqs

Special Instructions

GI Resection – Large: Ileostomy

Sample Reqs

Special Instructions

GI Resection – Large: Ileum

Sample Reqs

Special Instructions

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

Sample Reqs

Special Instructions

GI Resection – Large: Liver Wedge Resection

Sample Reqs

Special Instructions

GI Resection – Large: Oesophagectomy

Sample Reqs

Special Instructions

GI Resection – Large: Partial Hepatectomy

Sample Reqs

Special Instructions

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

Sample Reqs

Special Instructions

GI Resection – Large: Whipple’s Procedure / Pancreatectoduodenectomy

Sample Reqs

Special Instructions

GI-Resection – Small: Anal Fistula

Sample Reqs

Special Instructions

GI-Resection – Small: Appendix

Sample Reqs

Special Instructions

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

Sample Reqs

Special Instructions

GI-Resection – Small: Gallbladder

Sample Reqs

Special Instructions

GI-Resection – Small: Haemorrhoidectomy

Sample Reqs

Special Instructions

GI-Resection – Small: Hernia Sac

Sample Reqs

Special Instructions

GI-Resection – Small: Meckel’s Diverticulum

Sample Reqs

Special Instructions

GI-Resection – Small: Mesentery

Sample Reqs

Special Instructions

GI-Resection – Small: Perianal Biopsy / Warts

Sample Reqs

Special Instructions

GI-Resection – Small: Pilonidal Sinus

Sample Reqs

Special Instructions

GI-Resection – Small: Polypectomy

Sample Reqs

Special Instructions

GI-Resection – Small: Umbilical Lesion

Sample Reqs

Special Instructions

Giardia Serology

Sample Reqs

B

Special Instructions

Gilbert Syndrome – common UGT1A1 repeat variation

Sample Reqs

A
[9]

Special Instructions

[9] Clinical history must be provided.

Glaucoma NGS Panel – full gene sequencing across 26 genes

Sample Reqs

A
A
[9]

Special Instructions

[9] Clinical history must be provided.

Gliadin Antibodies (IgG) (deamidated )

Sample Reqs

B

Special Instructions

Globulin

Sample Reqs

B

Special Instructions

Glomerular Basement Membrane Abs

Sample Reqs

B

Special Instructions

Glucagon

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

Sample Reqs

A
[9]

Special Instructions

[9] Clinical history must be provided.

Glucose Challenge Test / Mini-GTT

Sample Reqs

G

Special Instructions

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

Glucose Tolerance Test (Extended Plus)

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)

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)

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

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

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

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

Sample Reqs

G

Special Instructions

Glutamic Acid Decarboxylase Antibodies (GAD 65)

Sample Reqs

B

Special Instructions

Glutathione (Red Cell)

Sample Reqs

H [5]

Special Instructions

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

Glutathione Peroxidase

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

Sample Reqs

ABB

Special Instructions

 

Gluten Sensitivity Evaluation (Coeliac disease antibody)

Profile details

Endomysial IgA

Gliadin deamidated lgG

Total IgA

Tissue Transglutaminase (IgA)

Sample Reqs

B

Special Instructions

 

Gluten/Coeliac Profile 2

Sample Reqs

A B

Special Instructions

Glycan Determinants

Sample Reqs

B

Special Instructions

Glycogen storage disease type 2 (Pompe) mutation analysis

Sample Reqs

A

Special Instructions

Gonorrhoea (PCR swab)

Sample Reqs

PCR

Special Instructions

Gonorrhoea (Thin Prep)

Sample Reqs

TPV

Special Instructions

Gonorrhoea (Urine)

Sample Reqs

FCRU

Special Instructions

Gonorrhoea by Culture

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

Sample Reqs

A A

Special Instructions

Group B Strep

Sample Reqs

2 x STM

Special Instructions

Growth Hormone (Fasting)

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

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

Sample Reqs

Special Instructions

Gynaecology: Cervical Polyp

Sample Reqs

Special Instructions

Gynaecology: Cervix

Sample Reqs

Special Instructions

Gynaecology: Curettings – Endocervical

Sample Reqs

Special Instructions

Gynaecology: Curettings – Endometial

Sample Reqs

Special Instructions

Gynaecology: Endometrial Biopsy

Sample Reqs

Special Instructions

Gynaecology: Endometrial Pipelle

Sample Reqs

Special Instructions

Gynaecology: Endometrial Polyp

Sample Reqs

Special Instructions

Gynaecology: Fallopian Tube

Sample Reqs

Special Instructions

Gynaecology: Fibroids

Sample Reqs

Special Instructions

Gynaecology: Fimbrial Cyst

Sample Reqs

Special Instructions

Gynaecology: LLETZ and / or Cone Biopsy

Sample Reqs

Special Instructions

Gynaecology: Mastoid

Sample Reqs

Special Instructions

Gynaecology: Ovarian Biopsy

Sample Reqs

Special Instructions

Gynaecology: Ovarian Cyst

Sample Reqs

Special Instructions

Gynaecology: Ovarian Pipelle

Sample Reqs

Special Instructions

Gynaecology: Ovaries (Bilateral)

Sample Reqs

Special Instructions

Gynaecology: Ovary (Unilateral)

Sample Reqs

Special Instructions

Gynaecology: Ovary and Tube (Bilateral)

Sample Reqs

Special Instructions

Gynaecology: Ovary and Tube (Unilateral)

Sample Reqs

Special Instructions

Gynaecology: Pelvic Mass

Sample Reqs

Special Instructions

Gynaecology: Peritoneal Biopsy

Sample Reqs

Special Instructions

Gynaecology: Placenta

Sample Reqs

Special Instructions

Gynaecology: Pouch of Douglas

Sample Reqs

Special Instructions

Gynaecology: Products of Conception

Sample Reqs

Special Instructions

Gynaecology: Uterine Polyp

Sample Reqs

Special Instructions

Gynaecology: Uterus

Sample Reqs

Special Instructions

Gynaecology: Uterus and Cervix

Sample Reqs

Special Instructions

Gynaecology: Uterus, Tubes And Ovaries

Sample Reqs

Special Instructions

Gynaecology: Vulval Biopsy

Sample Reqs

Special Instructions

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