Vitamin D 18.3 ng/ml means : causes, sources, risks, treatment

In this article we discuss what a Vitamin D value of 18.3 ng/ml means, what are its causes and how to calculate your Vitamin D deficiency risk score, and how to improve your Vitamin D as well as a treatment plan and possible risks.

What does a Vitamin D level of 18.3 mean?

A vitamin d level of 18.3 is considered to be deficient.

What is my Vitamin D level in SI units, for value of 18.3 in standard units?

In order to convert the value of Vitamin D from ng/ml into the SI Units, we must use a formula of conversion : Vitamin D in SI units (nmol/L) = Vitamin D in ng/ml*2.496¹ Based on the given formula, the value of Vitamin D in SI units for a value in ng/ml of 18.3 is 45.7 nmol/L

Is a Vitamin D value of 18.3 considered low or high?

Based on your Vitamin D value of 18.3. you are classified as having a moderate Vitamin D deficiency.

Vitamin D Levels

Category	Level (ng/mL)	Description
Severe Deficiency	< 10	Severely low vitamin D levels
Moderate Deficiency	10 - 20	Moderate Vitamin D Deficiency **You are here**
Insufficiency	20 - 30	Mild to Insufficient
Healthy	30 - 80	Normal Vitamin D Levels
Toxicity	> 80	Potentially harmful vitamin D levels

What are the sources of Vitamin D?

Food	How it helps with Vitamin D
Shrimp	Shrimp contain some Vitamin D, especially when consumed in larger quantities.
Bluefin tuna	Bluefin tuna is a fatty fish that contains high levels of Vitamin D.
Canned mackerel	Canned mackerel, like fresh mackerel, is a good source of Vitamin D.
Fortified dairy products	Milk, yogurt, and cheese are often fortified with Vitamin D to increase intake.
Fortified plant-based milk	Non-dairy milk alternatives (e.g., almond, soy) are often fortified with Vitamin D.
Egg yolks	Egg yolks contain small amounts of Vitamin D, especially if the hens are raised on Vitamin D-enriched feed.
Beef liver	Organ meats like beef liver contain Vitamin D, though levels can vary.
Fortified orange juice	Certain brands of orange juice are fortified with Vitamin D to increase its nutritional value.
Caviar	Fish roe, or caviar, can provide small amounts of Vitamin D.
Tofu	Some tofu products are fortified with Vitamin D, especially those made from soy milk.

What are the causes of Vitamin D deficiency?

Cause	Description
Certain autoimmune diseases	Autoimmune disorders may interfere with Vitamin D metabolism and utilization.
Certain genetic factors	Certain genetic variations can impact how the body processes and uses Vitamin D.
Kidney disorders	Kidney diseases can reduce the activation of Vitamin D in the body, affecting its functions.
Crohn's disease	An inflammatory bowel disease that can lead to malabsorption and nutrient deficiencies.
Celiac disease	An autoimmune disorder that damages the small intestine and impairs nutrient absorption.
Strict vegan or vegetarian diet	Limited intake of animal products, which are sources of Vitamin D, can contribute to deficiency.
Lack of fortified foods	A diet lacking in fortified dairy products or cereals may lead to lower Vitamin D intake.
Multiple sclerosis	People with multiple sclerosis often have lower Vitamin D levels, although the relationship is complex.
Dark skin	Higher melanin levels in dark skin reduce the skin's ability to produce Vitamin D from sunlight.
Older age	As people age, their skin becomes less efficient at converting sunlight into Vitamin D.

What symptoms will I experience with a Vitamin D of 18.3 ng/ml?

The symptoms of Vitamin D deficiency in children and adults are manifested by rickets and osteomalacia respectively. These conditions may show a variety of symptoms ranging from mild muscle pain, and bone pain to developmental abnormalities and fractures. For a Vitamin D level of 18.3 the symptoms are enlisted in the table below:

Vitamin D level 18.3 Symptoms in Children

Symptom	Description
Vision Problems	Rickets can affect the eyes, leading to problems such as night blindness and other visual disturbances.
Delayed Healing	Fractures and other injuries may take longer to heal in children with rickets.
Bone Pain	Children with rickets often complain of bone pain, which can be especially pronounced in the legs, pelvis, and spine.
Weak or Soft Bones	Rickets can cause bones to become weak and soft, leading to an increased risk of fractures.
Dental Problems	Rickets can affect the development of teeth, leading to dental issues such as delayed eruption and enamel defects.
Brittle Nails	Rickets can cause nails to become brittle and prone to breaking.
Fractures	Due to weakened bones, children with rickets are more prone to fractures even with minor injuries.
Delayed Walking	Some children with rickets may experience delays in achieving developmental milestones, like walking.
Irritability	Children with rickets might exhibit increased irritability and discomfort due to the physical pain they experience.
Bone Deformities	Rickets can lead to bone deformities, such as bowed legs or knock-knees, due to weakened bones unable to support the body's weight properly.

Vitamin D level 18.3 Symptoms in Adults

Symptom	Description
Chest Deformities	In severe cases, osteomalacia can lead to deformities in the ribs and chest.
Muscle Weakness	Muscle weakness can result from the lack of proper mineralization in the bones caused by osteomalacia.
Fatigue	Generalized fatigue and weakness are common symptoms of osteomalacia.
Bone Pain	Osteomalacia often leads to bone pain, particularly in the hips, lower back, and legs.
Fractures	Brittle and weak bones due to osteomalacia increase the risk of fractures even with minor injuries.
Easy Bruising	Weakened bones and blood vessels can lead to easy bruising in individuals with osteomalacia.
Delayed Healing	Fractures and injuries may take longer to heal due to impaired bone mineralization in osteomalacia.
Bone Deformities	Osteomalacia can lead to bone deformities, such as bowed legs or a curvature of the spine.
Difficulty Standing	Weak bones and muscles can make it challenging to stand for prolonged periods.
Frequent Infections	Impaired bone health can weaken the immune system, leading to an increased susceptibility to infections.

What additional risks do I face with a Vitamin D level of 18.3?

Level	Risk
Your value is Less Than 25	Increased risk of fallsBischoff-Ferrari
Your value is Less Than 21	Increased risk of diabetes, hypertension, obesity and high triglyceride levelsMartins D

What is my Vitamin D deficiency score and how to calculate it?

Since your value of Vitamin D 18.3 is below the normal limit of 30, you must evaluate the following 4 factors that may be contributing to your deficiency. Based on a study done by Garg et al the following Vitamin D Insufficiency and Deficiency Score can predict and determine your causes of deficiency.

As per the study 4 major factors are invovled in Vitamin D deficiency.

Factors and Descriptions

Factor	Description
Physical Activity	Engaging in regular physical activity can contribute to improved metabolism and Vitamin D levels.
Obesity	Obesity, indicated by a body mass index (BMI) of 25 kg/m² or higher, can lead to Vitamin D deficiencies
Diet	Dietary intake of at least 100 Grams (gms) of milk/dairy products OR at least 100 gms fish or 1 egg with yolk for four or more days in the last seven days was considered Adequate
Daily Sun Exposure	Daily exposure to sunlight is important for the body's synthesis of Vitamin D. Spending at least 1.75 hours in the sun each day can help maintain Vitamin D levels, which is essential for bone health and immune function.

• Insufficiency Score for Vitamin D : 18.3

• You get less than 1.75 hours of sunlight per day
• AND
• Insufficient Dietary Intake + Obesity
• AND
• Obesity OR Insufficient Exercise
• Score : Your Vitamin D Insufficiency Score ranges between 14 - 18.

What is the treatment plan for a Vitamin D level of 18.3?

Vitamin D supplmentation is the only way to correct for deficiencies. The tables below list the dosages of Vitamin D supplements recommeded for different age groups, depending on the level of the Vitamin D. Since your value of Vitamin D is 18.3 the relevant supplement dosages are indicated below.^{Pawel Pludowski}

Recommended Daily Dosing for Vitamin D in cases where the Vitamin D Level is between 10 ng/dl and upto 30 ng/dl

A first line of treatment involves increasing the dosage to 1.5-2 x the current level of supplements if the patient is taking any supplements.

If you are not taking any supplements, the values in the table below are to be followed.

Age Group	Vitamin D Intake Per Day	Duration
Infants < 1 month	1000 IU/d	2 months
Infants 1–12 months	1000 IU/d	2 months
Children 1–11 yrs.	1521 IU/d **(Represents a value in the range of 1000 - 2000, must be adjusted as per patient.)	2 months
Children 11–18 yrs.	3165 IU/d **(Represents a value in the range of 2000 - 4000, must be adjusted as per patient.)	2 months
Adults	4000 IU/d	2 months

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