How to Read Apgar Scores and Cord Blood Gases in a Birth Injury Record (Free Tool)

By John Mahoney · November 19, 2026 · 8 min read

Disclosure: MedLegal AI publishes the free Birth Injury Record Decoder described below. Where the tool is mentioned, it is labeled. Not legal or medical advice; whether a record supports an intrapartum cause is an obstetric and neonatal expert's opinion.

You get one page from a labor and delivery record that an obstetric expert will read first: the Apgar scores, the umbilical cord blood gas and the timed sequence of fetal heart rate findings, interventions and the delivery itself, each next to the published threshold it is usually compared against. The values are scattered across flow sheets, the delivery note, the lab system and the NICU note, and a first production rarely contains all of them. This post shows where each value lives, what the thresholds are, how to compute the decision-to-delivery interval honestly, and what to request before the expert opens the file.

What the record contains

Labor nursing notes and flow sheets. Timed vital signs, cervical exams, oxytocin rates, and the nurse's interpretation of the fetal heart rate tracing (baseline, variability, accelerations, decelerations, and often the category).
Physician and midwife progress notes. The plan, the decision to intervene and its time.
The delivery note. Mode of delivery, times, cord around the neck, condition at birth, who resuscitated.
Apgar scores. Recorded at 1 and 5 minutes for every infant and every 5 minutes to 20 if the score stays below 7, per ACOG Committee Opinion No. 644, The Apgar Score (2015, with the American Academy of Pediatrics; summary).
Umbilical cord blood gas. Arterial and venous pH, pCO2, pO2, bicarbonate and base deficit, usually in the lab system rather than the delivery note.
The neonatal resuscitation record and NICU admission note. What was done in the first minutes, and the exam, cooling decision and imaging that followed.
The electronic fetal heart rate strip itself. Usually a separate archived file, not part of the printed chart.

What to look for

1. Apgar scores, with their limits

Write down every score with its minute. ACOG Committee Opinion No. 644 describes the score as a convenient way to report the newborn's status immediately after birth and the response to resuscitation, and states that it has been inappropriately used to predict individual neurologic outcome. The ACOG and AAP task force report Neonatal Encephalopathy and Neurologic Outcome, Second Edition (executive summary in Obstetrics & Gynecology, 2014, doi:10.1097/01.AOG.0000445580.65983.d2) lists an Apgar score below 5 at 5 and 10 minutes among the neonatal signs consistent with an acute peripartum or intrapartum event. That is a list item an expert weighs, not a verdict.

2. Cord gas against the published thresholds

The same task force report lists an umbilical artery pH below 7.0, or a base deficit of 12 mmol/L or more, as the metabolic acidosis sign consistent with an acute intrapartum event. Confirm which vessel the value came from; a venous sample tells a different story from an arterial one, and some charts record only one.

3. Fetal heart rate findings as the record categorizes them

List the documented findings and the category the record itself assigns, with the time. Do not assign a category yourself from the nurse's description; that is the expert's job, from the strip.

4. Interventions and the response

Position change, oxygen, fluid bolus, stopping oxytocin, terbutaline, amnioinfusion, scalp stimulation, the call to the physician, the decision for operative delivery. Each with its time and the documented fetal response.

5. The decision-to-delivery interval

Subtract the decision time from the delivery time only when both are written down. The decision time in the physician note, the nursing note and the operating-room record frequently differ by minutes that matter. Record all of them.

Decode the record you already have

Paste the nursing notes, strip interpretations, delivery note, cord gas, Apgars and NICU admission note. The decoder returns the Apgars and cord gas next to the published thresholds, the documented FHR findings and interventions, the decision-to-delivery interval when both times exist, reviewer flags and a records-to-request list, each value with its quote. Free, no login.

Open the Birth Injury Record Decoder →

A worked example (hypothetical)

The facts below are invented for illustration. No real patient, clinician or hospital is described.

A 29-year-old woman at 39 weeks is admitted in labor and started on oxytocin. The nursing flow sheet records "recurrent late decelerations, minimal variability, Category II" at 03:40 and again at 04:10, with oxytocin continuing. At 04:35 the note reads "MD at bedside, decision for C/S." The delivery note records delivery at 05:22. Apgars are 2 at 1 minute, 4 at 5 minutes and 6 at 10 minutes. The lab system shows an umbilical artery pH of 6.94 and a base deficit of 15 mmol/L. The NICU note records "cooling initiated."

Pasted into the decoder, the output lists the three Apgars with their quotes and places the 5- and 10-minute scores next to the task force threshold (below 5 at 5 and 10 minutes), noting that the 10-minute score is above it. The cord gas table shows the pH and base deficit against the pH 7.0 and 12 mmol/L thresholds, both quoted. The FHR table shows only the categories the record assigned. The interventions table shows oxytocin continuing through two documented late-deceleration entries, with "not in text" for any response. The decision-to-delivery interval is computed as 47 minutes from the 04:35 decision note to the 05:22 delivery, with a flag to confirm the decision time from the operating-room record. The records-to-request list names the complete electronic strip, the oxytocin administration log and the neonatal resuscitation record.

For plaintiff counsel, the decode is the outline of the expert consult: oxytocin continued through documented late decelerations, a 47-minute interval, and cord gas values on the acidotic side of both thresholds. For defense counsel, it identifies the three documents that will decide whether the chart tells a different story than the excerpt does, and it shows the 10-minute Apgar sitting above the threshold.

What to request next

The complete electronic fetal heart rate strip for the admission, in native format, with the archived annotations.
The oxytocin administration log with every rate change and the order set in force.
The neonatal resuscitation record, including times for positive-pressure ventilation, intubation and compressions.
The laboratory report for the cord gas, showing the vessel sampled and collection and result times.
The operating-room record with the times the decision was communicated, the patient entered the room, and incision.
Placental pathology, neonatal imaging, and the cooling protocol documentation.

What the tool does not do

The decoder reports only values with a supporting quote and marks everything else "not in text." It does not assign an FHR category, does not interpret the strip, and does not decide whether the pattern fits an acute intrapartum event; that opinion weighs imaging, the neonatal exam and the placental pathology, and belongs to an obstetrician, maternal-fetal medicine specialist or neonatologist. Bates-cite every quote before it goes into a chronology or demand.

Next step: the whole labor and delivery production, strips included

Upload the complete record, scanned strips and NICU chart included, and get a Bates-cited chronology with the Apgars, cord gas and interventions placed in order.

Upload the chart →

Frequently asked questions

What cord blood gas values are commonly cited in birth injury cases?

An umbilical artery pH below 7.0 and a base deficit of 12 mmol/L or more are the thresholds the ACOG and AAP task force report, Neonatal Encephalopathy and Neurologic Outcome, Second Edition (2014), lists among the signs consistent with an acute peripartum or intrapartum event. They are published thresholds for a reviewer to compare against, not a diagnosis.

Does a low Apgar score prove a birth injury?

No. ACOG Committee Opinion No. 644 describes the Apgar score as a way to report the newborn's condition and response to resuscitation, and warns against using it to predict an individual child's neurologic outcome. A low 5- and 10-minute score is one item on a list of findings an expert weighs together.

What is the decision-to-delivery interval?

The time between the documented decision to perform a cesarean and the delivery time. The decoder computes it only when both times are written in the text. Confirm the decision time from the physician note and the operating-room record, because the two often differ.

What is most often missing from a first production in a birth injury case?

The complete electronic fetal heart rate strip, the oxytocin administration log and the neonatal resuscitation record. Request all three before an expert reviews the file.