Pediatric Gastroenterology and Nutrition Laboratory (PGNL)

The Pediatric Gastroenterology and Nutrition Laboratory (PGNL) provides a panel of specialized functional tests for the diagnosis and treatment of gastrointestinal disorders.

The PGNL plays an integral role with the Division of Gastroenterology by delivering additional diagnostic services in the following areas: CARE (Constipation and Reflux Evaluation) Program, Celiac Disease, Eosinophilic GI Disorders, Gastrointestinal Motility, Inflammatory Bowel Disease Program, Obesity, Pancreatic disorders, Tube Feeding Clinic, Liver Disease/Transplantation and Feeding/Swallowing Disorders.

The PGNL is a CLIA certified reference lab for the testing of intestinal disaccharidases (lactase, sucrase, glucoamylase and palatinase), pancreatic enzymes (lipase, trypsin and amylase) and stool alpha-1 antitrypsin.

Pediatric Gastroenterology and Nutrition Laboratory Requisition Form (PDF)

Recommended Protocol for Pancreatic Stimulation Test

Specimens collected via P catheter inserted through biopsy channel. Each specimen should be >0.5 ml if possible. Specimens should be placed on ice immediately, then frozen and stored at -75oC in an ultra-low freezer until ready to ship.

  1. Baseline collection (T0).
  2. Test dose of secretin (0.2 mcg) IV over 1 minute.
  3. Full dose of ChiRhoStim® (Human Secretin for Injection) (0.2 mcg/kg) and CCK (Kinevac) (0.02 mcg/kg) IV over 1 minute. ChiRhoStim® (Human Secretin for Injection) is available from ChiRhoClin, Inc. (301) 476-8388;
  4. Specimens collected at 5, 10, 15 minutes following secretin/CCK (T5, T10, T15). We recommend using a duodenal aspiration catheter.
  5. Each specimen must be at least 0.2 ml.
  6. We will interpret results when samples are obtained as outlined in this protocol. If the protocol is not followed, we will continue to provide the results of pancreatic enzyme measurements but will be unable to interpret results.

Normal Values for individual pancreatic enzymes*:

  • Lipase > 146.0 moles/ml/min.
  • Amylase > 32.0 moles/ml/min.
  • Trypsin > 55.4 nmoles/ml/min.

*Pancreatic function can only be considered as normal when the pre-stimulated or 1 of the post-stimulated aspirates (usually 5-10 mins) attains respective levels of activity as indicated.

Test Description Overview

Download the Test Description Overview (PDF)

Pediatric Gastroenterology Test Description Overview

Test Description Overview

Download the Test Description Overview (PDF)

Pediatric Gastroenterology Test Description Overview

License/Accreditation Certificates

The Pediatric Gastroenterology and Nutrition Laboratory maintains CLIA (Clinical Laboratory Improvement Amendments) certification through CMS (Centers of Medicare and Medicaid Services). You may view a current listing of the PGNL's accreditation/licensure below.

ID Numbers

Clinical Laboratory Improvement Amendments Certificate of Compliance (PDF)


PGNL CLIA Certificate

Specimen Transport Guide

Download the Specimen Transport Guide (PDF)

Specimen Transport Guide


Key Contacts

Medical Director
Nita Salzman, MD, PhD

Laboratory Manager
Mark Struve (PDF)

Laboratory Phone
(414) 955-4166

Contact Information & Specimen Delivery Address

Medical College of Wisconsin
Pediatric Gastroenterology and Nutrition Laboratory
Attn: Mark Struve
Department of Pediatrics – Gastroenterology
MACC Fund Research Center, Rm. 5029
8701 Watertown Plank Rd.
Milwaukee, WI 53226

(414) 955-4166 | Fax: (414) 955-6686

Hours of Operation

The laboratory is regularly staffed Monday through Friday, 7:00 am to 3:30 pm. (Central Standard Time).

The laboratory is closed the following dates: January 1, May 28, July 4, September 3, November 22 & 23, December 24 & 25.

Specimen Delivery Route

Shipments are to be delivered to the Medical College of Wisconsin Loading Dock. The loading dock is located off of Watertown Plank Road between 87th and 92nd streets by use of access road highlighted by red arrow (see map below).

Directions to MCW and Milwaukee Regional Medical Center