APT

Message

Do not confuse with APTT

Test Code

APT

Alias/See Also

Alkali resistance of fetal hemoglobin

CPT Codes
83033

Preferred Specimen

Vomitus or stool collected in any clean container.

Other Acceptable Specimens

Stool in a diaper may also be submitted

Specimen Stability

Room Temperature: Perform testing as soon as possible. If testing will be delayed, refrigerate the specimen. Refrigerated: No data available for stability of the specimen. Suggest testing within 24 hours of collection. Frozen: Do not freeze

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Samples not labeled with patient first and last name and date of birth

Methodology
Alkali denaturation

Setup Schedule

24/7

Report Available

Daily

Reference Range

Colorless - No hemoglbin detected

Clinical Significance

Bloody stools, due to intrinsic hemorrhage, are usually passed one day after birth, whereas those due to ingestion of maternal blood are usually passed within 12 hours after birth. This test is used to distinguish whether or not bloody infant vomit or stool is the result of ingestion of maternal blood during the birthing process or an internal hemorrhage.

Performing Laboratory

Frederick Health Laboratory
400 W 7th Street
Frederick, MD 21701

Last Updated: April 22, 2020

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.