Sodium 163 mEq/L: Is That High?

Is Sodium 163 mEq/L Low, Normal, or High?

Sodium 163 mEq/L is severely high and stands well outside the normal range of 135 to 145 mEq/L. You are 18 points above the top of normal and 8 points past the 155 mark that doctors treat as an emergency. Hospital labs flag a result like this as a critical value, which usually means someone picks up the phone and calls the ordering clinician right away. Most people never come anywhere near this number, because the body guards blood sodium inside a very narrow window. That makes 163 statistically rare, and the rarity itself carries useful information. Let's look at how uncommon this level really is, who tends to reach it, and what that tells you about your own result.

Hidden Risk of Sodium 163 mEq/L

The hidden risk in a rare value like 163 is that it almost never happens by chance, so it usually signals a real and ongoing process. A healthy person with normal thirst and free access to water has two powerful safeguards that keep sodium near 140, and both must fail for the level to climb this far. That double failure is the real story behind the number, and it stays dangerous until someone finds it.

• A reading of 163 points to a blocked thirst signal, a steady water loss, or both at once
• The brain feels the concentrated blood first, often as confusion, irritability, or unusual sleepiness
• People who cannot reach water, or cannot sense the need for it, are the most affected group
• Symptoms can lag behind the number when sodium has risen slowly over days
• Treating only the number without finding the cause invites a repeat episode

What Does a Sodium Level of 163 mEq/L Mean?

Picture a crowd where almost everyone is standing inside a small roped-off square. A few people stand just outside the rope, and one or two stand far across the field. On a population scale, blood sodium clusters very tightly: the vast majority of people sit between 135 and 145, and even among hospital patients, most stay inside or close to that square. A reading of 163 places you far across the field. Hospital studies cited by the National Institutes of Health find that severe hypernatremia, meaning sodium well above 155, appears in only a small percentage of admitted patients, and it concentrates heavily among people who are very old, very young, seriously ill, or unable to drink freely. In plain terms, your blood has lost so much water relative to salt that every liter is over-concentrated, and the body's usual rescue systems, thirst and the kidney's water-saving hormone, have not been able to fix it. So a sodium of 163 is not just high. It is statistically unusual, and that unusualness is a clue. It tells doctors that a specific cause is at work, not ordinary day-to-day variation, and that the cause is strong enough to overpower two separate layers of protection. Finding that cause is the whole job of the next 24 hours.

Lifestyle Changes for Sodium 163 mEq/L

Because 163 is both severe and uncommon, the only correct response is prompt medical care today, so the cause behind the outlier can be found and the level corrected safely. There is one piece of timing that matters more than anything else: sodium this high must come down slowly. Bringing it down too fast pulls water into brain cells and can swell the brain, which is why clinicians aim for a gradual, monitored fall rather than a quick fix. While you arrange care, sip water steadily in small amounts rather than gulping large volumes. Rest somewhere cool, skip exercise, and stay out of heat, since sweating drains more water. Keep taking prescribed medicines unless a clinician tells you otherwise, and bring their names with you, especially any water pill or lithium. A short written timeline of your drinking, urination, fever, vomiting, or diarrhea over the past week is genuinely valuable. It helps the team explain how you ended up so far outside the range where nearly everyone else sits, and it shortens the search for the cause. If you are reading this for a relative who cannot advocate for themselves, gather those same details on their behalf, because in this rare range the historian often matters as much as the patient.

Diet Changes for Sodium 163 mEq/L

Diet is a minor player next to fluid balance at this level, but sensible choices support recovery once a clinician is guiding your correction. The goal for now is gentle rehydration and a pause on concentrated salt, not a dramatic new eating plan. Favor foods that carry their own water.

• Choose water-dense produce like cantaloupe, oranges, cucumber, and tomatoes
• Sip plain water or a clinician-approved rehydration drink slowly through the day
• Pause salty snacks, deli meats, pickles, canned soups, and bottled dressings for now
• Limit alcohol and large coffees, since both push extra water out through urine
• Skip salt tablets and electrolyte powders entirely unless your care team prescribes them

Sodium 163 mEq/L in Men, Women, Elderly, and Kids

The population data make one thing very clear: severe hypernatremia is not spread evenly across ages. Older adults account for the largest share of readings like 163, especially people in care homes, people with dementia, or anyone who depends on others for a drink. The thirst signal genuinely weakens with age, so an older adult can be badly water-depleted without ever feeling thirsty. Infants and young children make up much of the remaining cases, because they concentrate quickly during fever, vomiting, or diarrhea and cannot ask for water or get it themselves. Healthy working-age adults are statistically the least likely group to reach 163. When they do, doctors strongly suspect a specific driver, such as lithium therapy, a hormone problem called diabetes insipidus, or extreme uncompensated water loss. Men and women share the same 135 to 145 range, with pregnancy and breastfeeding raising daily fluid needs rather than changing the range itself. In short, your age group shapes both how surprising the number is and how urgently the cause needs to be chased.

Medicine Effects on Sodium 163 mEq/L

Among the uncommon paths to 163, medicines are one of the more frequent, so a complete list of what you take narrows the search quickly. Do not stop anything on your own, because several of these drugs treat serious conditions, but make sure the team hears about each one.

• Diuretics, the water pills, increase water loss and are a leading drug-related cause
• Lithium can make the kidneys leak dilute water for years, a well-recognized contributor
• Strong or frequent laxatives pull water into the gut and out of the body
• Corticosteroids and some hospital IV fluids can push sodium upward
• Tube-feeding formulas can raise sodium when not enough free water is given alongside them

When to Retest Sodium 163 mEq/L

A sodium of 163 is rechecked within hours of starting treatment, not days, because tracking the fall is just as important as starting it. Clinicians at centers like Cleveland Clinic retest every few hours at first, with a firm goal: the level should drop by no more than about 10 to 12 points in a day. A faster fall risks brain swelling, so frequent labs are the safety rail for the whole correction. Expect additional tests beyond sodium itself, including urine concentration and urine sodium, kidney function, and sometimes blood sugar, since these point toward the cause. After you stabilize and the level returns toward normal, follow-up blood work is usually set within a few days, then again a week or two later. Because reaching 163 is statistically so unusual, your team will want firm proof of two things before they relax: that the level holds steady in the normal range, and that whatever drove it, a drug, a hormone problem, or blocked water access, has been corrected so you do not become an outlier twice.

Sodium 163 mEq/L — Frequently Asked Questions

When to See a Doctor About Sodium 163 mEq/L

Sodium at 163 mEq/L calls for medical care today, and its sheer rarity is one more reason to be evaluated rather than wait and retest later. Seek emergency help immediately for confusion, severe drowsiness, muscle twitching, or a seizure, and act just as fast for any older adult or child who seems lethargic, unusually irritable, or is not drinking. Do not try to fix this at home with large volumes of water, because the speed of correction matters and needs monitoring. Bring your medication list and a brief history of your fluids, urination, fever, and any recent illness. The reassuring news is that even an uncommon level like 163 is very treatable with careful, supervised rehydration, and most people recover fully when the fall is paced correctly. Because this number sits so far outside where nearly everyone else lives, getting checked promptly is the surest way to find what put you there and to make sure it does not happen again.

Written by

Ernestas K.

Clinical research writer specializing in human health, biology, and preventive medicine.

Reviewed against NIH, AHA, Mayo Clinic, NKF guidelines · Last reviewed June 11, 2026