[Severe increase in alkaline phosphatase levels during pregnancy]

Area of Science:

• Biochemistry
• Obstetrics
• Maternal-Fetal Medicine

Background:

• Maternal serum alkaline phosphatase (AP) levels physiologically increase twofold during pregnancy.
• Elevated AP levels beyond this physiological rise warrant consideration of potential underlying pathologies.

Observation:

• A case report details a 29-year-old pregnant woman presenting with a ninefold elevation in serum AP.
• This significant increase was attributed to elevated placental alkaline phosphatase levels.
• The patient experienced deep venous thrombosis and pulmonary emboli in the third trimester, without a clear correlation to the AP level.

Findings:

• The study highlights that serum AP levels can increase substantially beyond the typical twofold rise in pregnancy.
• Isozymes of alkaline phosphatase, particularly placental AP, contribute to these elevations.
• Investigating significantly elevated serum AP levels (>2-fold) is crucial for identifying potential complications.

Implications:

• This case underscores the importance of monitoring and investigating markedly elevated maternal serum AP levels during pregnancy.
• Understanding AP isozymes aids in differentiating physiological changes from pathological conditions.
• Prompt investigation of abnormal AP levels can lead to timely diagnosis and management of pregnancy-related complications.