Skip to main content
Submitted by Dr S. Patel on 22 May 2017

This time in our Health by Numbers/Medical Tests series, Dr Shital Patel takes a look at our electrolyte levels in our blood. An electrolyte imbalance, commonly caused by loss of body fluids through prolonged vomiting, diarrhoea, sweating or high fever, can result in various health disorders, like restlessness, anxiety, kidney diseases or even cardiac arrest.

An Electrolyte Panel is a blood test that measures the common minerals in the body such as sodium, calcium, chloride, magnesium, phosphorous, and potassium. This also includes bicarbonate or CO2 that takes the form of bicarbonate in blood. CO2 is the waste product of metabolism. Electrolytes are essential for the proper functioning of the heart, muscles and brain as they are needed to maintain balance in the body fluids.

An electrolyte panel blood test may be ordered as part of a regular health check or to check on any electrolyte changes.

SODIUM:

A sodium blood test, also called Serum sodium test allows a doctor to check on the sodium levels in the body. Sodium is an important mineral and electrolyte that is necessary for functioning of cells in the body and maintaining electrolyte balance. It is also called Na+.

Sodium is commonly found in foods that have them naturally or during cooking. It can be in the form of sodium chloride (salt) or as sodium bicarbonate (baking soda). It is also found in certain medications, such as paracetamol, aspirin, soluble ibuprofen, alka seltzer and laxatives and personal care products such as toothpaste, mouthwash, denture cleansers etc.

The blood, plasma and the lymph contain about 85% of the sodium in the body. A hormone called aldosterone which is produced by the adrenal gland is known to control some of the sodium levels via the kidneys. Apart from urine, sodium is also lost via stool and sweat. 

Normal results for sodium are 135 to 145 mEq/L (milliequivalents per liter), but these values may vary slightly from lab to lab.

High Sodium levels (Hypernatremia):

A high sodium level in the blood is also called Hypernatremia. This can be caused by several factors such as:

  • A high-sodium diet. (Learn about the DASH Diet) 
  • Dehydration or not drinking enough water. 
  • Water level imbalance due to certain medicines like diuretics, severe vomiting, diarrhea, Kidney disease, Cushing’s syndrome, diabetic ketoacidosis, diabetes insipidus, etc. 
  • High aldosterone levels or hyperaldosteronism.

Low Sodium levels (Hyponatremia):

A low sodium level in blood is termed Hyponatremia. Causes include:

  • Drinking too much water (psychogenic polydipsia). 
  • Poor nutrition.
  • Water loss from body due to excessive sweating, vomiting or diarrhea.
  • Underlying conditions such as underactive thyroid or adrenal glands, kidney disease, liver cirrhosis, heart failure, cystic fibrosis, SIADH (syndrome of inappropriate antidiuretic hormone secretion) etc.

Factors that may affect results:

  • Current medications such contraceptive pills, corticosteroids, antibiotics, antidepressants, heparin, estrogens, NSAIDs, lithium, hypertensive pills and diuretics.
  • Having high blood sugar levels
  • Recent saline IV fluid injection during a hospital stay.

Next in the series: Importance of Right Potassium Levels

 

Changed
14/Mar/2022

Stories

  • No more ‘sugar rush’
    Everything you eat is converted to sugar – yes, proteins and fats, too. A fast food meal spikes blood sugar by 30%. Nutritionist Kohila Govindaraju tells you how to break out of the vicious cycle of sugar rush, insulin spike, blood sugar drop, renewed hunger and weight gain.  Go for the slow burn  If you want your day to be more productive and rewarding, launch it with a nourishing meal. You will be more productive all day long if you invest just a few minutes in…
  • 9 reasons to get off that couch NOW
    Think you know all the reasons? Prepare to be surprised. By family practitioner and marathoner Dr Gita Mathai. Plus, how much to exercise to get its real benefits. We all want to look good, be slim and healthy. There’s one magic pill for this and it’s called exercise. Even if you’re ‘too tired’ or ‘too busy’, you need to get off that couch now.  Benefits of regular exercise Exercise helps to achieve ideal body weight if also combined with calorie restriction.…
  • Yoga comparable with walking, biking to improve cardiovascular risk
    Yoga has roots as an ancient mind-body practice that incorporates physical, mental and spiritual elements. Originating in India, yoga has been proven effective in numerous studies to improve cardiovascular risk factors, with a reduction in the risk of heart attacks and strokes. When compared with no exercise, yoga was associated with significant improvement in each of the primary outcome risk factors measured: Body mass index (BMI) reduced by 0.77 kg/m2 (measured as a "mean…
  • Jakarta’s young working generation increasingly prone to diabetes
    While this is a news item about Jakarta, it could well be about the youth of Mumbai, Delhi, Singapore.. Nurul Ratna Manikam, a Clinical nutritionist at Cipto Mangunkusumo General Hospital in Central Jakarta, said that most of her young patients worked an 8 a.m. to 5 p.m. shift and spent their mornings and nights commuting to and from their offices. They also spend most of their time sitting on a chair behind their desks or standing inside a bus or train and did not have time to…
  • Tears of a Clown
    Christina Kim, long one of the LPGA Tour's most effervescent personalities, opens up about her battle with depression. "I felt like all the fun and joy was suffocating me," she says now. "I looked down, and the water seemed very inviting, even though I can't swim. The solitude and silence that I was seeking, which I couldn't find anywhere in the building because everyone was laughing and living life and being happy, seemed to be in the water." She thought it over, stood there for about 15…
  • “I had a kidney transplant”
    Lalitha Nair, 49, talks about the pitfalls of suddenly falling victim to a life-threatening condition. Her experience and survival tips – from timely medical check-ups to insurance. When did you have the kidney transplant? I underwent kidney transplant on 3 Nov 2006 in a hospital in Bangalore. I was 41 years old. When were you diagnosed with kidney problem? Mid-October 2005 What were the early symptoms?  Nothing that was terribly alarming or significant. I went for a routine…
  • Diabetes FAQ - Questions that you wanted to ask but never did
    Based on a discussion with Dr. Venkat Rao, Diabetologist 1. My mother has diabetes. Should I get my blood sugar checked? I am now 30 years old.  Everybody should get their blood sugar tested once a year after the age of 30, irrespective of whether or not there is a family history of diabetes. This is especially true for Indians as India has a high incidence of diabetes.  If you have a family history of diabetes with a tendency of early occurrence; if you are obese…
  • For 13 years she was afraid of telling people she had Type 2 Diabetes
    Today Juliana Lim from Singapore is a team leader in a Diabetes Support Group inspiring others to be open about their condition. Read about her inspiring story
  • 7 reasons to love Chia Seeds. Plus 3 simple recipes.
    By nutritionist Kohila Govindaraju What are Chia Seeds ? They are a member of the mint family Why love them? • Chia seeds improve insulin sensitivity and glucose tolerance. The soluble fibre in the seeds helps to stabilise blood glucose levels. When soaked in liquid, they develop a gelatinous texture. This gel formation phenomenon creates the barrier between carbohydrates and digestive enzymes that ultimately slow down the conversion of carbohydrates into simple sugar.…
  • Malays, Indians with Type 2 diabetes more likely to suffer strokes, heart attacks: Study
    SINGAPORE: In a decade-long diabetes study, researchers from Khoo Teck Puat Hospital (KTPH) found that among those with Type 2 Diabetes Mellitus (T2DM), Malays and Indians are at higher risk of cardiovascular diseases compared to Chinese patients. Malay patients had two times higher risk while Indians had 1.7 times higher risk of diseases such as heart attacks and strokes, compared to Chinese patients with T2DM, according to findings of a study released by the healthcare cluster that manages…