Fasting Before Blood Tests: New Study Questions Necessity
Translated & summarized from Vesty by baba
A South Korean study of 9.7 million blood tests suggests prolonged fasting before most analyses is unnecessary, with minimal impact on results for common tests like blood counts and cholesterol. While some indicators like glucose and triglycerides varied with fasting duration, the study did not assess diagnostic impact. Israeli doctors acknowledge the findings, noting fasting's difficulty for some patients, and suggest current guidelines should be re-evaluated but followed for now.
The story in 6 lines · by baba
- South Korean study of 9.7 million blood tests questions necessity of prolonged fasting.
- Fasting duration had minimal impact on most common blood test results.
- Glucose and triglyceride levels varied significantly with shorter fasting periods.
- Israeli doctor confirms findings align with practice, notes fasting difficulty for some.
- Current fasting guidelines should be followed until updated.
- Shorter fasting could significantly ease patient preparation if proven accurate.
A large-scale study from South Korea, analyzing 9.7 million test results from over 101,000 adults between February 2021 and December 2023, suggests that prolonged fasting before blood tests may not be necessary for most analyses. The research, published by Ynet, found that in the majority of cases, the duration of fasting had a minimal impact on test results, indicating that preparation for many tests could be simplified for patients.
Researchers compared test outcomes for 121 indicators after fasting periods of less than 8 hours, 8-12 hours, and over 12 hours. Significant differences were observed in only 10 indicators when comparing the same individuals under different fasting durations. For common tests like complete blood counts, kidney and liver function, electrolytes, and cholesterol, fasting duration had virtually no effect on the results.
However, the study did note some variations. Glucose levels were 10.8% higher after less than 8 hours of fasting compared to over 12 hours, while triglycerides were 20.1% higher. Certain enzymes like GGT and lipase also showed higher levels with shorter fasting periods. Conversely, bilirubin and vitamin D levels were higher after fasting for more than 12 hours. The study authors cautioned that findings related to pancreatic enzymes were based on a small number of patients and did not assess whether these variations impacted diagnoses or treatment decisions.
Israeli family doctor Itamar Tzadok of Clalit Health Services stated that the study's findings align with his clinical observations. He noted that fasting can be particularly difficult for the elderly and individuals with mental health conditions. Tzadok also clarified that drinking water is recommended before tests and that black coffee without sugar or milk might not necessitate postponing a test, though it could affect results for patients with metabolic syndrome. He emphasized that while the study suggests a need to re-evaluate fasting requirements based on specific tests, patients should continue to follow current medical and laboratory recommendations until guidelines change.
Tzadok expressed hope that Israeli guidelines might soon be updated to reflect these findings, potentially easing the burden on patients if shorter fasting periods are proven to yield accurate results without compromising medical outcomes.
The same event, reported separately by each outlet. Open a few to compare what different newsrooms emphasize — and what they leave out.
Centre 1Other 1
