Overview: Pregnancy-Associated Plasma Protein A TestIntroduction: The Pregnancy-Associated Plasma Protein A Test measures PAPP-A to diagnose pregnancy complications, causing fetal growth issues. Following 2023 ACOG guidelines, it uses biochemical methods for high specificity, supporting pregnancy screening. This test is critical for guiding diagnosis, treatment planning, and improving outcomes in biochemistry for pregnant patients with suspected complications like preeclampsia or fetal growth restriction.
Other Names: PAPP-A Assay, Pregnancy Complication Marker Test.
FDA Status: Laboratory-developed test (LDT), meeting biochemistry standards for diagnostic accuracy.
Historical Milestone: PAPP-A testing began in the 1990s with prenatal screening research. Biochemical methods improved in the 2000s, enhancing diagnostic precision.
Purpose: Measures PAPP-A to diagnose pregnancy complications, guides treatment, and evaluates patients with fetal growth issues.
Test Parameters: 1. PAPP-A Level
Pretest Condition: Fasting for 10-12 hours required. Collect serum or plasma. Report history of fetal growth issues or pregnancy complications.
Specimen: Serum (SST, 2-5 mL), Plasma (EDTA, 2-4 mL). Transport in a biohazard container.
Sample Stability at Room Temperature: 8 hours
Sample Stability at Refrigeration: 7 days
Sample Stability at Frozen: 6 months
Medical History: Document fetal growth restriction, preeclampsia, or history of pregnancy complications. Include current medications, especially antihypertensives.
Consent: Written consent required, detailing the tests purpose, pregnancy complication implications, and risks of sample collection.
Procedural Considerations: Uses immunoassays to measure PAPP-A levels. Results are available in 1-2 days, supporting clinical decisions. Performed in laboratories, often for pregnancy complication diagnosis.
Factors Affecting Result Accuracy: Improper fasting or sample hemolysis can affect results. Gestational age impacts PAPP-A levels.
Clinical Significance: Low PAPP-A confirms pregnancy complications, guiding monitoring or early delivery. Normal results may require ultrasound confirmation.
Specialist Consultation: Consult an obstetrician for result interpretation and treatment planning.
Additional Supporting Tests: Fetal ultrasound, Doppler studies, or hCG levels to confirm pregnancy complication diagnosis.
Test Limitations: Non-specific for certain complications; clinical correlation is needed. Sample quality affects sensitivity.
References: ACOG Prenatal Guidelines, 2023; Obstetrics & Gynecology, Smith GC, 2022.
