Bicarbonate in Cord Blood, Arterial (calculated)

This test estimates the level of bicarbonate in the arterial blood of the umbilical cord collected right after birth. Bicarbonate is a key buffer that helps keep the body’s acid-base balance within a healthy range. In cord arterial blood, it reflects the baby’s metabolic component of acid-base status at the time of delivery.

Because it is calculated from other blood gas values, it is part of a standard cord blood gas panel. It complements measurements such as pH and carbon dioxide to give a fuller picture of the newborn’s condition at birth.

Clinicians use cord blood bicarbonate to help assess how well a baby tolerated labor and delivery, and to look for signs of metabolic stress. A value that is lower or higher than expected can suggest a shift toward acidemia or alkalemia from metabolic causes, guiding decisions about monitoring and care.

This test is often ordered together with other cord blood gases to evaluate possible complications such as decreased oxygen delivery, placental problems, or difficult labor. The sample is taken from the cord after it is clamped, so there is no additional risk to you or your baby.

Your baby’s bicarbonate result is interpreted alongside cord blood pH, carbon dioxide, base excess, and the clinical story of the delivery. A lower bicarbonate typically points toward a metabolic acid load, while a higher value may suggest a metabolic alkalosis pattern or compensation for respiratory changes. These patterns can overlap, so the care team looks at the complete panel rather than any single number.

If the result is unexpected, your provider may correlate it with the baby’s examination, repeat testing if needed, and watch for any signs that additional care is required. Differences in sampling or handling can affect results, so laboratories and clinicians consider these factors when interpreting the value.