When families receive birth records after a difficult delivery, two sets of numbers often stand out: the Apgar score and the cord blood gas results. If you are researching a low Apgar score birth injury claim, understanding what these values actually measure — and what they do not — is a critical first step. Medical records can be difficult to interpret without context, and misreading them in either direction can lead families toward wrong conclusions about what happened.
This article provides general legal information; consult a licensed Illinois attorney for advice specific to your situation.
What the Apgar Score Actually Measures
The Apgar score is a quick clinical assessment performed at one minute and five minutes after birth. It grades five observable signs — appearance (skin color), pulse, grimace (reflex response), activity (muscle tone), and respiration — each on a scale of zero to two. A score of seven to ten is considered normal. Scores below seven prompt clinical intervention and additional evaluation.
An important limitation is stated plainly in ACOG/AAP Committee Opinion 644, “The Apgar Score” (2015, reaffirmed 2021): a low Apgar score alone does not establish that birth asphyxia occurred, and it does not reliably predict long-term neurological outcomes. Committee Opinion 644 notes that the score was designed as a clinical tool to guide resuscitation decisions in the delivery room — not as a legal or causation standard. A score can be depressed by prematurity, infection, sedating medications given to the mother, or fetal conditions unrelated to oxygen deprivation. Conversely, some infants who experienced significant asphyxia initially score within normal limits.
This does not mean the Apgar score is irrelevant to a legal case. Serial scores — particularly a persistent five-minute score below five, or a ten-minute score below three — are considered clinically meaningful indicators that warrant further investigation. What Committee Opinion 644 cautions against is treating any single low number as proof of wrongdoing.
Understanding Cord Blood Gas Analysis
Cord blood gas testing measures the chemical composition of blood drawn from the umbilical artery and vein immediately after delivery. The most clinically significant values are:
- pH: A measure of acid-base balance. ACOG guidance identifies umbilical artery pH below 7.0 as the threshold for significant acidemia. Normal umbilical artery pH is approximately 7.20–7.30.
- Base deficit (BD): Reflects the degree of metabolic acidosis. A base deficit at or beyond −12 mmol/L in the umbilical artery is associated with increased risk of neonatal encephalopathy, according to ACOG criteria. A base deficit beyond −16 mmol/L is considered severe.
- pCO2: Reflects respiratory function; elevated values can indicate acute hypercapnia.
- Lactate: Some institutions report lactate as an additional marker of oxygen debt in tissues.
These values give clinicians a snapshot of the fetal environment at the moment of delivery. A cord gas drawn promptly and correctly can help distinguish between acute oxygen deprivation occurring close to delivery versus a chronic in-utero process that began well before labor — a distinction that matters significantly in causation analysis.
Why Experts Look at Multiple Data Points, Not Just One Number
The second edition of the AAP/ACOG publication “Neonatal Encephalopathy and Neurologic Outcome” establishes a multi-variable framework for assessing whether hypoxic-ischemic encephalopathy (HIE) in a newborn is causally linked to intrapartum events. That framework considers: (1) sentinel events during labor such as uterine rupture or placental abruption, (2) fetal heart rate monitoring patterns showing acute change consistent with the claimed event, (3) cord blood gas values at or below established thresholds, (4) Apgar scores that remain low at ten minutes despite resuscitation, (5) early neuroimaging findings consistent with hypoxic-ischemic injury, and (6) multi-organ dysfunction in the newborn period.
No single criterion is sufficient. A low cord pH without corresponding clinical signs carries different weight than a low cord pH accompanied by a sentinel intrapartum event, a nonreassuring fetal heart rate pattern, and early neuroimaging consistent with hypoxic-ischemic injury. Medical experts retained in birth injury litigation review the totality of this evidence when forming causation opinions.
What These Records Mean for Your Legal Case
Families reviewing birth records for the first time frequently encounter a problem: the numbers appear significant, but interpreting them requires understanding both normal reference ranges and the clinical context of their specific delivery. A cord arterial pH of 7.08, for example, falls below ACOG’s 7.10 threshold but above the 7.0 threshold for severe acidemia. Whether that value supports or undermines a causation theory depends on what else is in the record — the fetal monitoring strips, nursing notes, resuscitation documentation, and newborn course.
This is why expert evidence in birth injury cases is indispensable. A qualified obstetric or neonatal expert can place each data point into the appropriate clinical framework, explain what the fetal heart rate pattern shows in the minutes before delivery, and give an opinion — grounded in the published ACOG/AAP criteria — about whether the evidence is consistent with preventable intrapartum asphyxia.
Attorneys evaluating these cases typically work with both obstetric and neonatal experts to assess both sides of the causation question: what happened during labor, and what the newborn’s clinical course indicates about the timing and severity of any oxygen disruption.
Gathering the Right Records
To conduct this kind of analysis, an attorney and retained experts need the complete labor and delivery record — not just the delivery summary. The critical documents include the full fetal heart rate monitoring strips (not a summary), nursing notes with timestamps, chain-of-command escalation documentation, the admission and delivery notes, cord blood gas laboratory reports with the exact specimen collection time, Apgar documentation, and the complete NICU chart if the infant required neonatal intensive care.
Requesting only a discharge summary or a narrative summary of the delivery is insufficient for causation analysis. Illinois law and federal HIPAA regulations both give families the right to request and receive the complete record. The process for doing so is straightforward once you know what to ask for.
Talk to a Chicago Attorney — Free Consultation
If your child received a low Apgar score at birth, or if you have cord blood gas results you do not fully understand, speaking with an attorney who handles birth injury cases can help you assess whether those records warrant further investigation. Phillips Law Offices represents families throughout Illinois in birth injury and medical malpractice matters.
Call (312) 346-4262 or visit our contact page to schedule a free, confidential consultation. There is no fee unless we recover compensation for you.