Find out if you might be vitamin D deficient for free - 2 minutes, 11 questions

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Vitamin D Self Exam - (probably 2024)

1. Do you stay indoors between 10 am to 2 pm?
2. Do you have a dark skin tone?
3. Are you overweight or obese?
4. Are you suffering from Diabetes or High Blood Pressure?
5. Do you often feel pain in the muscles?
6. Do you frequently suffer from a a radiating pain in the neck, shoulder or back?
7. Do you feel very tired and weak after a long day?
8. Are you suffering from recurring attacks of cold or cough?
9. Do you regularly use sunscreen/umbrella when going out?
10. Do you often fall sick?
11. Does your wounds take longer to heal?
12. Do you tend to forget things very often?
13. How often do you consume alcohol?

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VitaminDWiki – Tests for Vitamin D contains:

• Fact: Many countries no longer pay for more than 1 (some not pay for even a single Vit D test)
    They feel that Vit D testing is not needed except for a few conditions (Rickets, etc) Japan is an exception
• Fact: Vit D tests are not very accurate
     The best lab tests have accuracies and repeatabilities of +-5 ng
     Low cost vitamin D Blood Tests - both in lab and at home
     Many lab tests have accuracies and repeatabilities of +- 10 ng - or worse
     Vitamin D deficiency of a group - 15% to 48%
• Fact: Low-cost office/home Vit D tests are available around the world (not US as of 2018)
     Low-cost 35 ng Y/N test by Nanospeed
     Low-cost Vitamin D testers (two yes-no tests for 11 dollars) - 2024 Nanospeed
     Quick, free, self test for deficiency
• Fact: 3 major Vit D gene problems are not noticed by Vit D tests
     ~ 20% of people have poor Vit D genes
     Hint that Vit D not getting to cells: Vit D related diseases run in your family
     Another hint - you have one of the 40 diseases which are 2X more likely if have poor genes
• Fact: A Vit D test will rarely (<1 in 1000) indicate that you are getting too much
• Opinion: If only getting a single test, wait till after supplementing with Vit D
     3 months after starting a maintenance dose or 4 weeks after a loading dose

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VitaminDWiki – Predict Vitamin D category contains:

It is very difficult to predict the response to supplementation of Vitamin D, or additional sun/UV
There are a huge number of factors involved.
 
This page also has studies predicting deficiency without Vitamin D tests

Examples of 81 studies that Predict Vitamin D levels

• 96% prediction of Vitamin D less than 20ng (not general nor cost-effective) - May 2024
• Vitamin D deficiency predicted with 91% accuracy ( AI, age, paywall) - April 2024
• Predictors of low vitamin D: race, age, and BMI (confirmed now by Machine Learning) – Feb 2024
• Low Vitamin D screening with just 5 questions (for less than 12 ng) – June 2022
• Top 10 signs of Vitamin D Deficiency (9 minute Video) - Oct 2021
• Estimate Vitamin D levels based on questionnaires (12 studies) – July 2020
• Is a senior Vitamin D insufficient - a 2 minute questionnaire is 85 percent accurate – Nov 2019
• Simple Vitamin D deficiency scoring system – Feb 2016
• Toward predicting vitamin D levels without a blood test. by VitaminDWiki
• Excellent prediction of very low vitamin D in elderly from just 16 questions (analyzed by ML) – June 2017
• Quick, free, self test of vitamin D deficiency 90% chance <20 ng