Class 3: Volume loss from 30% to 40% of total blood volume, from 1500 mL to 2000 mL. A significant drop in blood pressure and changes in mental status occur. Heart rate and respiratory rate are significantly elevated (more than 120 BPM). Urine output declines. Capillary refill is delayed. Class 4: Volume loss over 40% of total blood volume. Hypotension with narrow pulse pressure (less than 25 mmHg). Tachycardia becomes more pronounced (more than 120 BPM), and mental status becomes increasingly altered. Urine output is minimal or absent. Capillary refill is delayed.Again, the above is outlined for a healthy 70 kg individual. Clinical factors must be taken into account when assessing patients. For example, elderly patients taking beta blockers can alter the patients physiologic response to decreased blood volume by inhibiting mechanism to increase heart rate. As another, patients with baseline hypertension may be functionally hypotensive with a systolic blood pressure of 110 mmHg. Non-bleeding
Various laboratory values can be abnormal in hypovolemic shock. Patients can have increased BUN and serum creatinine as a result of pre-renal kidney failure. Hypernatremia or hyponatremia can result, as can hyperkalemia or hypokalemia.Lactic acidosis can result from increased anaerobic metabolism. However, the effect of acid–base balance can be variable as patients with large GI losses can become alkalotic. In cases of hemorrhagic shock, hematocrit and hemoglobin can be severely decreased.
Islam
The three core principles in Shia tradition: Tawhid (Oneness of God), Nabuwwa (Concept of Prophethood), Imama (Concept of Imam)

Buddhism
The Triple Bodhi (ways to understand the end of birth) are Budhu, Pasebudhu, and Mahaarahath. The Three Jewels, the three things that Buddhists take refuge in. Shinto
The Imperial Regalia of Japan of the sword, mirror, and jewel. Daoism
The Three Treasures (Chinese: 三寶; pinyin: sānbǎo; Wade–Giles: san-pao), the basic virtues in Taoism. The Three Dantians
Three Lines of a Trigram
Three Sovereigns: Heaven Fu Xi (Hand – Head – 3º Eye), Humanity Shen Nong (Unit 69), Hell Nüwa (Foot – Abdomen – Umbiculus). Hinduism
The Trimurti: Brahma the Creator, Vishnu the Preserver, and Shiva the Destroyer. The three Gunas found in Samkhya school of Hindu philosophy. The three paths to salvation in the Bhagavad Gita named Karma Yoga, Bhakti Yoga and Jnana Yoga. Zoroastrianism
The three virtues of Humata, Hukhta and Huvarshta (Good Thoughts, Good Words and Good Deeds) are a basic tenet in Zoroastrianism. Norse mythology
Three is a very significant number in Norse mythology, along with its powers 9 and 27. Prior to Ragnarök, there will be three hard winters without an intervening summer, the Fimbulwinter. Odin endured three hardships upon the World Tree in his quest for the runes: he hanged himself, wounded himself with a spear, and suffered from hunger and thirst. Bor had three sons, Odin, Vili, and Vé. Other religions
The Wiccan Rule of Three. The Triple Goddess: Maiden, Mother, Crone; the three fates. The sons of Cronus: Zeus, Poseidon, and Hades. The Slavic god Triglav has three heads.