Dr. Thomas Klein is a board-certified clinical hematologist serving as Chief Medical Officer at Kantesti AI. With over 15 years of experience in laboratory medicine and a strong interest in AI-supported interpretation of blood test results, he works to connect new technology with everyday clinical practice. His areas of interest include biomarker analysis, clinical decision support research and population-specific reference range optimization. As CMO, he contributes clinical input to the platform's internal benchmarking and provides clinical oversight for the medical quality of Kantesti's educational reports.

Low G6PD Activity: Lab Results, Retesting and Safety

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G6PD Deficiency Lab Interpretation 2026 Update Patient-Friendly Low G6PD enzyme activity means red cells may be less able to handle oxidative stress, but a normal result during or soon after hemolysis can be falsely reassuring. The safest next step is usually a quantitative repeat test after recovery, with medication decisions guided by the prescribing clinician. 📖 ~11 minutes 📅 August 7, 2026 📝 Published: August 7, 2026 🩺 Medically Reviewed: August 7, 2026 ✅ Evidence-Based This guide was written under the leadership of Dr. Thomas Klein, MD in collaboration with the Kantesti AI Medical Advisory Board, including contributions from Prof. Dr. Hans Weber and medical review by Dr. Sarah Mitchell, […]

AI Medical Report Explanation: Source Checks and Safety

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AI Safety Lab Interpretation 2026 Update Patient-Friendly An AI summary can make laboratory results easier to read, but it cannot supply missing clinical facts or replace an urgent medical assessment. Use this patient-first framework to test what the summary knows, what it guessed, and what needs a clinician. 📖 ~11 minutes 📅 August 7, 2026 📝 Published: August 7, 2026 🩺 Medically Reviewed: August 7, 2026 ✅ Evidence-Based This guide was written under the leadership of Dr. Thomas Klein, MD in collaboration with the Kantesti AI Medical Advisory Board, including contributions from Prof. Dr. Hans Weber and medical review by Dr. Sarah Mitchell, MD, PhD. Lead Author Thomas Klein, MD […]

Schistocytes in Blood Test Results: When Smears Are Urgent

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Hematology Lab Interpretation 2026 Update Patient-Friendly Schistocytes are fragmented red cells that can signal dangerous small-vessel clotting, but a single smear comment is not a diagnosis. Urgency depends on the fragment percentage, platelet count, haemoglobin trend, kidney function, haemolysis markers, and symptoms. 📖 ~11 minutes 📅 August 7, 2026 📝 Published: August 7, 2026 🩺 Medically Reviewed: August 7, 2026 ✅ Evidence-Based This guide was written under the leadership of Dr. Thomas Klein, MD in collaboration with the Kantesti AI Medical Advisory Board, including contributions from Prof. Dr. Hans Weber and medical review by Dr. Sarah Mitchell, MD, PhD. Lead Author Thomas Klein, MD Chief Medical Officer, Kantesti AI Dr. […]

Low Cystatin C Causes: Meaning, Diet and Next Steps

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Kidney Health Lab Interpretation 2026 Update Patient-Friendly A cystatin C result below range is usually a context issue rather than a warning sign. The useful question is whether the result fits your kidney function, thyroid status, pregnancy stage, and testing method. 📖 ~11 minutes 📅 August 7, 2026 📝 Published: August 7, 2026 🩺 Medically Reviewed: August 7, 2026 ✅ Evidence-Based This guide was written under the leadership of Dr. Thomas Klein, MD in collaboration with the Kantesti AI Medical Advisory Board, including contributions from Prof. Dr. Hans Weber and medical review by Dr. Sarah Mitchell, MD, PhD. Lead Author Thomas Klein, MD Chief Medical Officer, Kantesti AI Dr. Thomas […]

Low AMH Causes: Age, Surgery and Test Timing

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Reproductive Hormones Lab Interpretation 2026 Update Patient-Friendly A low anti-Müllerian hormone result usually reflects the normal age-related fall in the pool of developing follicles, but surgery, cancer treatment, hormonal medicines, pregnancy, and assay differences can also matter. It estimates likely egg yield with stimulation far better than it predicts whether you can conceive this month. 📖 ~11 minutes 📅 August 6, 2026 📝 Published: August 6, 2026 🩺 Medically Reviewed: August 6, 2026 ✅ Evidence-Based This guide was written under the leadership of Dr. Thomas Klein, MD in collaboration with the Kantesti AI Medical Advisory Board, including contributions from Prof. Dr. Hans Weber and medical review by Dr. Sarah Mitchell, […]

What Low Free Testosterone Means: SHBG and Follow-Up

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Hormone Health Lab Interpretation 2026 Update Patient-Friendly A low free testosterone result means the fraction of testosterone available to tissues may be reduced, even when total testosterone is normal. The result needs confirmation with the right method, morning timing, SHBG, albumin, symptoms, and medical context. 📖 ~11 minutes 📅 August 6, 2026 📝 Published: August 6, 2026 🩺 Medically Reviewed: August 6, 2026 ✅ Evidence-Based This guide was written under the leadership of Dr. Thomas Klein, MD in collaboration with the Kantesti AI Medical Advisory Board, including contributions from Prof. Dr. Hans Weber and medical review by Dr. Sarah Mitchell, MD, PhD. Lead Author Thomas Klein, MD Chief Medical Officer, […]

High C-Peptide Results: Insulin Resistance and Other Causes

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Endocrinology Lab Interpretation 2026 Update Patient-Friendly A high C-peptide usually means your pancreas is still making substantial insulin, often because the body needs extra insulin to overcome resistance. The glucose level, A1c, medicines, meal timing and eGFR determine whether that explanation fits. 📖 ~11 minutes 📅 August 6, 2026 📝 Published: August 6, 2026 🩺 Medically Reviewed: August 6, 2026 ✅ Evidence-Based This guide was written under the leadership of Dr. Thomas Klein, MD in collaboration with the Kantesti AI Medical Advisory Board, including contributions from Prof. Dr. Hans Weber and medical review by Dr. Sarah Mitchell, MD, PhD. Lead Author Thomas Klein, MD Chief Medical Officer, Kantesti AI Dr. […]

What Does Low Insulin Mean? Glucose and C-Peptide Clues

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Endocrinology Lab Interpretation 2026 Update Patient-Friendly A low insulin result is often a normal response to fasting, not a diagnosis. The deciding clues are the glucose level measured at the same time, C-peptide, symptoms, medicines, and the conditions of the draw. 📖 ~11 minutes 📅 August 5, 2026 📝 Published: August 5, 2026 🩺 Medically Reviewed: August 5, 2026 ✅ Evidence-Based This guide was written under the leadership of Dr. Thomas Klein, MD in collaboration with the Kantesti AI Medical Advisory Board, including contributions from Prof. Dr. Hans Weber and medical review by Dr. Sarah Mitchell, MD, PhD. Lead Author Thomas Klein, MD Chief Medical Officer, Kantesti AI Dr. Thomas […]

What Does High Free T3 Mean? Biotin and Assay Errors

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Thyroid Testing Lab Interpretation 2026 Update Patient-Friendly An isolated high free T3 result deserves a careful laboratory check before it is labelled hyperthyroidism. Supplements, assay design, and antibodies can create a convincing but incorrect result. 📖 ~11 minutes 📅 August 5, 2026 📝 Published: August 5, 2026 🩺 Medically Reviewed: August 5, 2026 ✅ Evidence-Based This guide was written under the leadership of Dr. Thomas Klein, MD in collaboration with the Kantesti AI Medical Advisory Board, including contributions from Prof. Dr. Hans Weber and medical review by Dr. Sarah Mitchell, MD, PhD. Lead Author Thomas Klein, MD Chief Medical Officer, Kantesti AI Dr. Thomas Klein is a board-certified clinical hematologist […]

Zinc Blood Test: Fasting, Timing and Accurate Results

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Trace Minerals Lab Interpretation 2026 Update Patient-Friendly A serum zinc result can shift substantially with a recent meal, afternoon collection, acute illness, low albumin or a poorly handled sample. Here is how I separate a real zinc problem from a pre-analytic artefact before recommending treatment. 📖 ~11 minutes 📅 August 5, 2026 📝 Published: August 5, 2026 🩺 Medically Reviewed: August 5, 2026 ✅ Evidence-Based This guide was written under the leadership of Dr. Thomas Klein, MD in collaboration with the Kantesti AI Medical Advisory Board, including contributions from Prof. Dr. Hans Weber and medical review by Dr. Sarah Mitchell, MD, PhD. Lead Author Thomas Klein, MD Chief Medical Officer, […]