Critically High Plasma Ammonia in an Adolescent Girl
Bibliographic record
Abstract
A 12-year-old female patient presented with nonspecific symptoms including fatigue, fever, and headache persisting for approximately 4 months. Plasma ammonia was 230 μg/dL (135 μmol/L) (critical value >187 μg/dL or 110 μmol/L). The patient was referred to a pediatric emergency center for urgent evaluation of hyperammonemia. Plasma and urine amino acid testing was performed to investigate the possibility of a urea cycle disorder; however, all results were normal. Over the following 2 weeks, the patient was treated with intravenous sodium benzoate/sodium phenylacetate and l-arginine to reduce the blood ammonia concentration. However, the patient's ammonia concentration never dropped below 94 μg/dL (55 μmol/L) (upper limit of reference interval, 80 μg/dL or 47 μmol/L), with concentrations as high as 296 μg/dL (174 μmol/L) with inconsistent associations between ammonia concentrations and headaches. During the course of treatment, the patient suffered substantial side effects of intravenous therapy and underwent numerous costly clinical and laboratory investigations. Amino acid investigations were repeated but results remained normal. Given the large fluctuations in blood ammonia concentrations with inconsistent response to intravenous medications, the metabolic service contacted the laboratory to inquire about a possible preanalytical or analytical cause. One week before this query, a community physician also contacted the laboratory regarding hyperammonemia in several patients. However, no obvious preanalytical or analytical errors were discovered despite numerous audits of preanalytical conditions and review of quality control data.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.003 | 0.005 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".