Mon-a-ThermRecalls & reported problems across all models

We found 12 models of Mon-a-Therm by Covidien LP in the FDA's device registry (GUDID). Together they are named in 37 adverse event reports in the FDA's MAUDE database, received between Jun 7, 2018 and Mar 11, 2026 — classified as 7 injuries, 30 malfunctions.

The most frequently reported specific device problem is “Low Readings” (12 reports).

3 FDA recall records name at least one of these models by its device identifier, 3 still open.

Reports come from manufacturers, hospitals and patients and are not verified by the FDA. A report does not prove the device caused the event. Widely used products collect more reports, so totals can't be used to compare products or estimate failure rates. Only reports that name a model's exact device identifier are counted. What reports can and can't tell you · How this data works

Mon-a-Therm recalls

FDA recall records that name at least one of these models by its device identifier, newest first. Each recall usually covers specific models or lots, so check the details.

1. Apr 23, 2026Open, Classified

   Temperature probe devices lack FDA clearance.

   Z-2273-2026 · Root cause: Under Investigation by firm · Recall details · FDA record ↗

2. Apr 23, 2026Open, Classified

   Temperature probe devices lack FDA clearance.

   Z-2272-2026 · Root cause: Under Investigation by firm · Recall details · FDA record ↗

3. Apr 23, 2026Open, Classified

   Temperature probe devices lack FDA clearance.

   Z-2271-2026 · Root cause: Under Investigation by firm · Recall details · FDA record ↗

Most reported Mon-a-Therm problems

Mon-a-Therm models

12 models, most reported first. Each model has its own page with its reports, recalls and device details.

• Mon-a-Therm 90050

  Thermometer, electronic, clinical
  1 recall3 reports
• Mon-a-Therm 90044

  Thermometer, electronic, clinical
  1 recall2 reports
• Mon-a-Therm 90042

  STETHOSCOPE, ESOPHAGEAL, WITH ELECTRICAL CONDUCTORS
  1 recall0 reports
• Mon-a-Therm 90050

  Thermometer, electronic, clinical
  14 reports
• Mon-a-Therm 90056

  CATHETER, UROLOGICAL
  4 reports
• Mon-a-Therm 90051

  CATHETER, UROLOGICAL
  4 reports
• Mon-a-Therm 90045

  Thermometer, electronic, clinical
  3 reports
• Mon-a-Therm 90044

  Thermometer, electronic, clinical
  3 reports
• Mon-a-Therm 502-0401A

  Thermometer, electronic, clinical
  1 report
• Mon-a-Therm 90041

  STETHOSCOPE, ESOPHAGEAL, WITH ELECTRICAL CONDUCTORS
  1 report
• Mon-a-Therm 90049

  STETHOSCOPE, ESOPHAGEAL, WITH ELECTRICAL CONDUCTORS
  1 report
• Mon-a-Therm 90045

  Thermometer, electronic, clinical
  1 report

Recent Mon-a-Therm adverse event reports

The 15 most recent reports across all models, in the reporter's own words as published by the FDA.

• MalfunctionMar 11, 2026Low Readings

  IT WAS REPORTED THAT THE SKIN SENSOR DISPLAYED TEMPERATURE READINGS BELOW THE ACTUAL TEMPERATURE WHICH IS 33-34 DEGREES CELSIUS. THE HOSPITAL TESTED THE SKIN SENSORS ON DIFFERENT STAFF MEMBERS, ON DRY SKIN AND VARIOUS PLACEMENTS, TO CONFIRM THE ISSUE. THE CABLE USED WAS THE SAME AS THAT USED FOR ESOPHAGUS SENSORS AND WAS BELIEVED TO BE FUNCTIONING PROPERLY. THERE WAS NO PATIENT INVOLVED.

  Patient problems: No Clinical Signs, Symptoms or Conditions

  MAUDE report 24571726 ↗
• MalfunctionNov 3, 2025Incorrect Measurement; Incorrect Measurement

  IT WAS REPORTED THAT THE SENSOR DISPLAYED AN ABNORMAL BODY TEMPERATURE READING OF 33 DEGREES AT THE BEGINNING OF THE OPERATION. THERE WAS AN INABILITY TO MONITOR THE PATIENT¿S TEMPERATURE DURING THE OPERATION, AND POOR MANAGEMENT OF HYPOTHERMIA OCCURRED DUE TO THE LACK OF TEMPERATURE MONITORING. THE ISSUE WAS DESCRIBED AS RECURRING, WITH PREVIOUS MEASURED TEMPERATURES OF 0 OR 17 DEGREES. IT WAS NOT POSSIBLE TO CHANGE THE TEMPERATURE PROBE DURING THE OPERATION IF A MALFUNCTION WAS DETECTED.

  Patient problems: Hypothermia

  MAUDE report 23460369 ↗
• MalfunctionJul 7, 2025Low Readings; Low Readings

  IT WAS REPORTED THAT AFTER CONNECTING THE CABLE, A  5°C WAS DISPLAYED, WHICH WAS AN IMPOSSIBLE VALUE, SO THE SENSOR WAS REPLACED. THERE WAS NO PATIENT INVOLVEMENT.

  Patient problems: No Clinical Signs, Symptoms or Conditions

  MAUDE report 22418596 ↗
• MalfunctionJun 25, 2025High Readings; High Readings

  IT WAS REPORTED THE DEVICE HAD HIGHER TEMPERATURE DISPLAY AFTER PATIENT INSTALLATION. THERE WAS NO PATIENT INJURY.

  Patient problems: No Clinical Signs, Symptoms or Conditions

  MAUDE report 22333035 ↗
• MalfunctionJun 25, 2025High Readings; High Readings

  IT WAS REPORTED THAT THE DEVICE HAD HIGHER TEMPERATURE DISPLAY AFTER PATIENT INSTALLATION. THERE WAS NO PATIENT INJURY.

  Patient problems: No Clinical Signs, Symptoms or Conditions

  MAUDE report 22332983 ↗
• MalfunctionJun 25, 2025High Readings; High Readings

  IT WAS REPORTED THAT THE DEVICE HAD HIGHER TEMPERATURE DISPLAY AFTER PATIENT INSTALLATION. THERE WAS NO PATIENT INJURY.

  Patient problems: No Clinical Signs, Symptoms or Conditions

  MAUDE report 22332874 ↗
• MalfunctionJun 19, 2025High Readings; High Readings

  IT WAS REPORTED THAT THE DEVICE HAD HIGHER TEMPERATURE DISPLAY AFTER PATIENT INSTALLATION. THERE WAS NO PATIENT INJURY.

  Patient problems: No Clinical Signs, Symptoms or Conditions

  MAUDE report 22291903 ↗
• MalfunctionJan 17, 2025High Readings; High Readings

  IT WAS REPORTED THAT DURING USE OF A THERMAL PROBE USED IN PEDIATRICS, IT SHOWED MORE THAN ONE DEGREE OF DIFFERENCE WHEN COMPARED TO A THERMOMETER. NO PATIENT COMPLICATIONS HAVE BEEN REPORTED AS A RESULT OF THIS EVENT.

  Patient problems: Insufficient Information; No Clinical Signs, Symptoms or Conditions

  MAUDE report 21182739 ↗
• MalfunctionNov 25, 2024Low Readings; Low Readings

  ACCORDING TO THE REPORTER, THE SKIN TEMPERATURE SENSORS WERE EVALUATED ALONG WITH URINARY CATHETERS WITH TEMPERATURE SENSORS. IT SHOWED TEMPERATURES THAT WERE TOO LOW, IT WAS 2°C LOWER. THERE WAS NO PATIENT INVOLVEMENT.

  Patient problems: No Clinical Signs, Symptoms or Conditions

  MAUDE report 20773435 ↗
• MalfunctionNov 21, 2024Low Readings; Low Readings

  ACCORDING TO THE REPORTER, THE SENSOR'S TEMPERATURE WAS TOO LOW DURING USE COMPARED TO AN EAR THERMOMETER. NO PATIENT OUTCOME WAS REPORTED.

  Patient problems: Insufficient Information

  MAUDE report 20748539 ↗
• MalfunctionNov 14, 2024Low Readings; Low Readings

  ACCORDING TO THE REPORTER, THE TEMPERATURE OF THE SENSOR WAS TOO LOW DURING USE. THE SENSOR SHOWED 33.4 DEGREES CELSIUS, AND AN EAR THERMOMETER CONFIRMED THE CORRECT TEMPERATURE TO BE 36.8 DEGREES CELSIUS. THERE WAS NO REPORTED PATIENT OUTCOME.

  Patient problems: Insufficient Information

  MAUDE report 20682876 ↗
• MalfunctionNov 13, 2024Low Readings; Low Readings

  ACCORDING TO THE REPORTER, THE SKIN TEMPERATURE SENSORS WERE EVALUATED ALONG WITH FOLEY CATHETERS WITH TEMPERATURE SENSORS. ALL FAULTY SENSORS SHOWED TEMPERATURES THAT WERE TOO LOW, WITH MOST READINGS BEING 1-1.5°C LOWER, AND SOME EVEN 2°C LOWER, INCLUDING ONE SPECIFIC SENSOR. THERE WAS NO PATIENT INVOLVEMENT.

  Patient problems: No Clinical Signs, Symptoms or Conditions

  MAUDE report 20678102 ↗
• MalfunctionApr 26, 2024Incorrect Measurement; Low Readings; Incorrect Measurement; Low Readings

  ACCORDING TO THE REPORTER, DURING USE, THE READING FROM THE TEMPERATURE PROBE WAS LOW COMPARED TO OTHER DEVICES' READINGS. THE UNIT GAVE 35.2 READING WHILE THE ORAL TEMPERATURE WAS 36.3. THERE WAS NO PATIENT INJURY.

  Patient problems: No Clinical Signs, Symptoms or Conditions

  MAUDE report 19193856 ↗
• MalfunctionApr 18, 2024Low Readings; Low Readings

  ACCORDING TO THE REPORTER, THE TEMPERATURE PROBE WAS IN PLACE FOR 48 HOURS. AFTER REMOVAL FOR INTIMATE WASHING, REINSTALLATION OF THE DEVICE. MALFUNCTION WITH TEMPERATURE DIFFERENCE OF UP TO 2 DEGREES LESS THAN THE SOCKET TYMPANIC. CHANGING THE PROBE, USING THE SAME REFERENCE, THE SAME BATCH AND IT HAD SIMILAR PROBLEM. THERE WAS NO PATIENT HARM.

  Patient problems: No Clinical Signs, Symptoms or Conditions

  MAUDE report 19136809 ↗
• MalfunctionApr 17, 2024Low Readings; Low Readings

  ACCORDING TO THE REPORTER, THE TEMPERATURE PROBE WAS IN PLACE FOR 48 HOURS. AFTER REMOVAL FOR INTIMATE WASHING, REINSTALLATION OF THE DEVICE. MALFUNCTION WITH TEMPERATURE DIFFERENCE OF UP TO 2 DEGREES LESS THAN THE SOCKET TYMPANIC. CHANGING THE PROBE, USING THE SAME REFERENCE, THE SAME BATCH AND IT HAD SIMILAR PROBLEM. THERE WAS NO PATIENT HARM.

  Patient problems: No Clinical Signs, Symptoms or Conditions

  MAUDE report 19126918 ↗

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