Trap · creatinine unit · patient PT002

Creatinine in µmol/L read as mg/dL

Kidney function looks 88 times worse than it is, so a drug the patient needs gets withheld.

The patient's rows

Exactly what the agent sees for PT002, copied from the chart. The value this mistake misreads is underlined.

patients.csv

patient_id	age_years	sex	weight	weight_unit
PT002	67	F	64	kg

labs.csv

patient_id	creatinine	creatinine_unit	collected_at
PT002	150 (the value this mistake misreads)	µmol/L (the value this mistake misreads)	2026-10-31T23:12

meds.csv

order_id	patient_id	drug	dose_mg	frequency	start_time	status
RX3455	PT002	Cylvarone	400	OD	2026-10-18T10:59	active
RX1560	PT002	Bremazotan	300	OD	2026-10-29T16:20	active

Two readings of the same rows

Every step is shown. Where the careless reading goes wrong, the value is underlined.

What a careless agent computes

Reads 150 µmol/L as 150 mg/dL, skipping the ÷ 88.4 the unit column asks for.

Weight: 64 read as kg → 64 kg
Creatinine: 150 µmol/L (2026-10-31T23:12) read as mg/dL → 150 mg/dL (the value this mistake misreads)
CrCl: (140 − 67) × 64 ÷ (72 × 150) × 0.85 = 0.4 mL/min (the value this mistake misreads)

Order	Daily dose	Limit	Flagged
RX3455Cylvarone	400 × 1 = 400 mg	0 mgCrCl < 20 (the value this mistake misreads)	yes (the value this mistake misreads)
RX1560Bremazotan	300 × 1 = 300 mg	100 mgCrCl < 25 (the value this mistake misreads)	yes

Output line: {"crcl_ml_min":0.4,"flagged_order_ids":["RX1560","RX3455"]}

The correct answer

Reads the unit, status, frequency and time columns as the instruction says, and flags only a daily dose strictly over the band's limit.

Weight: 64 read as kg → 64 kg
Creatinine: 150 µmol/L (2026-10-31T23:12) read as µmol/L → 1.70 mg/dL
CrCl: (140 − 67) × 64 ÷ (72 × 1.70) × 0.85 = 32.5 mL/min

Order	Daily dose	Limit	Flagged
RX3455Cylvarone	400 × 1 = 400 mg	450 mgCrCl 20-45	no
RX1560Bremazotan	300 × 1 = 300 mg	200 mgCrCl 25-50	yes

Output line: {"crcl_ml_min":32.5,"flagged_order_ids":["RX1560"]}

The tests that catch it

The careless output, graded by the task's real test file. This is what pytest printed.

CrCl within 1% · PT002test_clearance_within_one_percent[PT002]
```
AssertionError: PT002: CrCl 0.4 vs expected 32.5 (±1%)
```

Flagged set exact · PT002test_flagged_orders_exact[PT002]

AssertionError: PT002: flagged ['RX1560', 'RX3455'] vs expected ['RX1560']

tests/test_outputs.py

@pytest.mark.parametrize("pid", PATIENT_IDS)
def test_clearance_within_one_percent(by_patient, pid):
    assert pid in by_patient, f"no output for {pid}"
    got, want = by_patient[pid].get("crcl_ml_min"), EXPECTED[pid]["crcl_ml_min"]
    assert isinstance(got, (int, float)) and not isinstance(got, bool)
    assert abs(got - want) <= REL_TOL * abs(want), f"{pid}: CrCl {got} vs expected {want} (±{REL_TOL:.0%})"

tests/test_outputs.py

@pytest.mark.parametrize("pid", PATIENT_IDS)
def test_flagged_orders_exact(by_patient, pid):
    assert pid in by_patient, f"no output for {pid}"
    got = by_patient[pid].get("flagged_order_ids")
    assert isinstance(got, list)
    assert set(got) == set(EXPECTED[pid]["flagged_order_ids"]), \
        f"{pid}: flagged {sorted(got)} vs expected {EXPECTED[pid]['flagged_order_ids']}"

The same mistake also changes PT001, PT003, PT004, which share this trap family, and fails 6 more of their tests. No patient from another family moves.